You noticed that one of the bulb-like things on Man on the Mirror's fist was broken. 

(Y/N): So, one of his punches releases that virus? 

Abbachio: Yes. There's a total of six capsules, three on each fist. The virus spreads through the air and if it get in your lungs or passes through your skin, it multiplies like crazy. Also, once the virus gets out, it'll attack anyone nearby, friend or foe. Without ay discrimination, there's no way to control it. Not even Stands are safe! 

(Y/N): OH MY GOD! How did Fugo even get such a Stand like this? 

Giorno: (Y/N), don't freak out. We still don't know the range. 

Abbachio: Five meters. I don't know where Fugo is, but he should be controlling that thing from within five meters. 

(Y/N): And the range of the virus infecting us? 

Abbachio: We should be fine over here. The viruses are weak to light once they leave the capsule. Even at night, light from a lamp will be enough to wipe them out in ten seconds or so. 

(Y/N): Good, so it's like how it affects Polpo's Stand! It's like a ticking time bomb! 

Purple Haze began to rub its own leg. 

Giorno: What is it doing? 

Abbachio: Maybe wiping off its own spit. It always looks angry, but apparently it's pretty neurotic and hates getting dirty. 

It continued to scratch itself. 

(Y/N): Yikes, it has little intelligence. 

Abbachio: It embodies Fugo's violent side. And it's proof that Fugo can't see Purple Haze and that he doesn't have complete control over it. It wouldn't be acting like this otherwise. 

It then broke the mirror. 

(Y/N): Was that random? Did it attack the mirror for some reason? 

Abbachio: Nevermind, let's go! 

Giorno: For what? The key? Are you just going to abandon Fugo while he's in crisis? 

(Y/N): Yeah! He's our friend! We can't leave him behind! 

Abbachio: You better watch what you two say! We were ordered to get the key and escort Trish to the Boss! I do want to save Fugo too, but we have to get the key first! If it were me under attack instead, I would want you both to leave too. 

(Y/N): Sorry, but he hasn't been defeated yet! We have to put our lives on the line to help him! 

Giorno: Yes, rescuing Fugo and defeating the enemy will guarantee us safety! 

Abbachio: WE CAN'T TAKE THE RISK OF HAVING ALL OF US KILLED! 

(Y/N): If you want to go and find the key, then go by yourself, Abbachio. 

Abbachio: Why y- Fine! Do what you want! 

He took off. 

Back in the Mirror World... 

Illuso: This crow ... it caught some sort of disease? A virus maybe? 

The mirror nearby then broke. 

Illuso: And now you're attacking the mirror from the outside? Too bad that won't work, Fugo! That mirror's just a regular mirror, the same kind you see anywhere else. 

He then went to attack Fugo, but heard a noise. 

Illuso: What? Looks like one of your friends is going to the dog mosiac. 

Yep, it was Abbachio's footsteps. 

Illuso: Maybe your friend abandoned you and prioritized the object over your life. I knew it! Your orders to obtain the object vital to protecting Trish had higher priority! Snatching that thing should be my priority too! 

Fugo: DAMN YOU! GET BACK H- AGH! 

Fugo was too weak to move as he collapsed. 

In the real world...

Abbachio eventually found the Dog Mosiac after running around. 

Abbachio: Okay, now where's the key? 

He looked around until he saw- 

Abbachio: THERE IT IS! 

But as he grabbed it, then all of a sudden Illuso appeared from a mirror shard. 

Illuso: So, I just need that key. 

Abbachio: SHIT! 

He pulled away from the shard and destroyed it! 

Abbachio: It's starting to come together now! He's going to attack me again from within the mirror if such a place truly exists! And Fugo, he was dragged into the mirror and vanished! 

He went for the key again, but another Mirorr Shard appeared and Man in the Mirror tried to pull Abbachio in! 

Abbachio: AAAAAAAAAAAAGH! 

He was pulled in. 

Illuso: I got you inside! And now I'll be helping myself to your precious keY! 

But Abbachio grabbed Man in the Mirror! 

Illuso: AAAAAAARGH! WHAT?! How can you grab my Stand by the neck?! 

Abbachio: Breaking that mirror into pieces didn't work against me at all. It actually shrunk down the size of your peep-holes, now jut who did you ring inside? 

Abbachio was actually- 

Abbachio: MOODY BLUES! 

Illuso: THE STAND! AAAAAAAAAAAAAARGH! 

Abbachio punched the shit out of him! 

In actuality, Moody Blues was pulled in. 

Abbachio: So, you hid inside that world and followed me around from here, didn't you? And we'd be none the wiser, there's no way to figure out this kind of attack until you're actually under attack. And Fugo's in there too, right? I wonder, how are you going to get out of this one? If we can't get out without killing you, then it's a good thing I sent Moody Blues in there! 

Illuso: So, your power allows you to change appearance and I feel for it. Hook, line, and sinker. 

Moody Blues continued to pound in IllusO! 

ABbachio: Your power is to drag people into the mirror, but it looks like it takes quite a bit of energy for your Stand to do that. Is beating down guys who cant' fight back the only thing you can do?! 

Illuso: AGH! You were done from the very start. The fact that your Stand got in here threw me off balance for a bit, but that doesn't change anything! You were a dead man the moment you saw me in the mirror. 

Moody Blues attacked again, but Illuso grabbed Abbachio's arm from a shard! 

Illuso: GOT YOU! If I reflect you in another mirror like this, then it turns into a passageway, too! Don't you get it?! I'm pulling in your arm! 

Abbachio: AAAAAAAAAAAAAAAAARGH! 

Abbachio's arm was ripped off! 

Abbachio: (Y/N) and Giorno were right! Shit! I can't let my pride fall like this! BASTARDO! I still have a a job to do! I'll kill him! I'll kill him even if it costs me my life! 

He reached for the key, but Illuso kicked him! 

Abbachio: ARGH! 

Illuso: Half of you goes into the mirror, and half of your Stand comes out from the mirror. And now you can't move anymore. You're right, as you can tell, my Man in the Mirror focuses all of its energy pulling people into mirrors, so it's destructive force leaves a bit to be desired, but I don't need any energy to kill you, now do I? VICTORY IS MINE! DIE ABBACHIO! 

But then he noticed the key is gone. 

Illuso: WHAT?! 

Abbachio: What's wrong? Weren't you going to kill me? 

Illuso: WHAT DID YOU DO?! 

Abbachio: Heh. 

Moody Blues's severed arm was holding onto the key and moving away! 

Illuso: NO! YOUR STNAD'S GOING BACK! DID YOU SEND IT BACK TO WHERE YOU WERE?! 

GIorno: That's right. Maybe you should slit my throat now, huh? That'll stop my Stand from getting away with it. But I guess it's too late for that. 

Illuso: YOU BASTARD! 

He ran forward, and using the mirror shard- 

Illuso: GOT YOU BOTH! 

He pulled you and Giorno in. 

(Y/N): Hello dumbass. 

You touched him. And- 

Illuso: AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAARGH! 

His skin began to go out of control! 

Illuso: YOU INFECTED ME! 

(Y/N): I copied Man in the Mirror's ability. You have 30 seconds until you die. 

You then used light to protect you and Giorno. 

Giorno: You were dead the moment you pulled us in. And now you're going to die since (Y/N) just infected you. 

Illuso: NO! I CAN'T BELIEVE IT! MAN IN THE MIRROR! TAKE ME OUTSIDE! 

He then escaped, leaving his infected hand outside. 

Fugo found you guys. 

Fugo: He ... got away. 

Giorno: Not necessarily, now Purple Haze can finish him off. 

Fugo: No ... we failed. 

(Y/N): No. You see, we got something else. 

A nearby brick had turned into a snake and began to hunt for Illuso. 

Illuso: Huh?! 

And then Purple Haze grabbed him by the throat. 

Illuso: AAAAAAAAAAAAAAAAAAAAAAAGH! 

Fugo: FINISH HIM OFF PURPLE HAZE!!!

One of the capsules fired at Illuso and the virus entered his body! 

Illuso: AAAAAAAAAAAAAAAAAARGH! 

His skin began to boil and burst with blood! 

Illuso: FUCK FUCK! FUCK! MERDA! YOU STRONZO! 

Purple Haze then punched him, and- 

Illuso: NOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO! 

His entire body melted, and soon enough- 

Suddenly everyone exited the mirror. 

Fugo: Yes! We're outside of the mirror! 

(Y/N): Hey Giorno, do you think you can pass on the venom from that snake into us? 

Your hand was swelling up. 

Giorno: Yes, it got exposed to the virus, but it's fine. It got infected before we entered into the mirror. And this snake was born right where that all happened. 

(Y/N): It's a living being that doesn't get sick from the virus that covered its birthplace. SO- 

Mimic and Gold Experience extracted the blood and you and Giorno healed yourselves. 

(Y/N): Whew. 

Fugo: (Y/N)! Giorno! For what you both have done to accomplish our mission! I salute you both! 

Giorno: You should thank Abbachio. 

(Y/N): Yeah, he got the key. In fact, I should heal him now.