Yelena's P.O.V

When I finally come to I see I'm in the lower levels of the Avengers Compound with Nat and Mia.

Nat looks at Mia and I.

Natasha: Are you two okay?

Mia and I nods.

Yelena: Yeah, I'm okay. But that really hurt.

Mia: I'm good too, what about you?

Natasha: I've been better.

After that I point my flashlight upwards.

Yelena: Y/N! Steve! Tony!

I look and see that Mia has the gauntlet with her.

We then hear a noise and turn around.

Natasha shine her flashlight in the direction the noise was coming from.

When she does we see a massive group of those space dogs we fought back in Wakanda.

Mia: Oh shit.

Natasha: We've gotta run now come on!

The three of us start running in the other direction.

Y/N's P.O.V

I wake up and my vision becomes more clear.

After a moment I stand to my feet and deactivate my mask.

I look around and see Tony standing up.

Tony: Hey kid, you okay?

Y/N: Yeah, I'm good.

I then look see Cap's shield and go over to pick it up.

Not far from there I see over Steve unconscious on the floor.

Tony goes over and kicks him.

Tony: Come on buddy, wake up.

Steve wakes up.

Tony: That's my man.

Tony then helps Steve to his feet and I go over to them.

Y/N: You lose this thing again I'm keeping it.

He smiles.

Y/N: I'm joking.

I hand him the shield.

Steve: What happened?

Tony: Well when you mess with time, it tends to mess back. You'll see, now come on.

Tony, Cap and I go outside and see Thor looking down at Thanos, or at least a different Thanos.

Y/N: God damn it. Why's he back? Or better yet how is he back?

Tony shrugs his shoulders.

Tony: So, what's he been doing?

Thor: Absolutely nothing.

Steve: Where are the stones?

Y/N: I don't know, but if I had to guess I'd say the stones are somewhere under all this.

Tony: All we know is that he doesn't have 'em.

Steve: Then let's keep it that way.

Thor: You know that's a trap, right?

Y/N: Yeah, but I don't really give fuck.

Tony: Same.

Thor: Good, just as long as we're all in agreement.

Thor summons both Mjölnir and Stormbreaker to himself and this causes him to suit up with the rest of us.

Thor: Let's kill him properly this time.

Cap, Thor, Tony and I walk down to face Thanos for the second time.

(A/N: Just imagine Y/N is there with them.)

When the four of us get closer to Thanos he sees us coming over.

Thanos: You couldn't live with your own failures and where did that bring you? It brought you to me. I thought be eliminating half of all life, the other half would thrive. But you've shown me that's not possible.

Y/N: Yeah. We're human, and all kinds of stubborn.

He smirks and stands up.

Thanos: Thanks to all of you I know now what I must do. Once I have the stones you have collected for me I will shred this universe down to it last atom and create a new one, teeming with life. That knows not what it has lost but what it has been given. A grateful universe.

Thanos then pulls his sword out of the ground.

Steve: A universe born out of blood.

Thanos: They'll never know it. Because you won't be alive to tell them.

Thor screams and Tony and I go up in the air to attack Thanos.

I activate my mask and charge at Thanos.

I land back on the ground Thor throws Mjölnir, but Thanos knocks it away.

When Mjölnir comes back around I call it to me, this causes it to hit Thanos in the back of the head.

(A/N: Like before, just imagine Y/N is there fighting too.)

Justin's P.O.V

So I'm stuck in the Compound with Rhodey, Bruce, Isaac and Rocket while the Compound as it quickly fills up with water.

Bruce, Isaac and I are holding up some concrete to stop it from crushing Rhodey and Rocket.

Isaac: Damn! This shit is heavy!

Bruce: Rhodey, Rocket get out!

Justin: We can't hold this shit for much longer!

The two look at each other.

Rhodey: See you on the other side guys.

Rocket: Yep.

We then hear Scott over the comms.

Scott: Hold on! I'm coming!

Y/N's P.O.V

Cap, Tony, Thor and I continue to fight Thanos. Thor passes Mjölnir to me, as Tony then lands infront of us.

Tony: Okay, Y/N, Thor hit me!

We both summons lighting, Thor and I combine the lighting along with my venom blast to hit Tony's suit and that powers up his repulsor blast that hits Thanos.

I run towards Thanos while Thor calls Mjölnir back to himself. Once I'm close enough Thanos grabs both Tony and I.

Thanos let's the two of us get hit by Mjölnir that was thrown by Thor.

This causes both Tony and I to get knocked away and hit a pile of concrete.

Due to this I black out. 

I wake up again I see Cap fighting Thanos alone.

Then Steve's shield is broken by Thanos' sword, Cap then and he gets knocked away.

I manage to get back up, then I jump up and hit Thanos in the back.

Thanos and I continue to fight one on one and me being me I start making jokes to annoy him.

After this Thanos grabs me by the throat and smashes me to the ground and holds me in the air.

Thanos: I'm gonna crush you like the little bug you are.

Y/N: Well, actually spider's are technically classed as arachnids. So you'd actually be wrong in assuming...

This angers him.

Thanos: Do you ever shut up?!!

He then throws me.

I struggle to get to my feet, but I manage it, then I look to Thanos.

Y/N: Sorry, but no. My fans expect a certain amount of quips in every  fight.

He throws his sword towards me, but I manage jump over it.

I then rush Thanos, but he hits me hard, breaking my nano-tech mask in the process. This sends me back and I land next to Cap on the ground.