Y/n fails to find the vampire. When morning hits, he head to Ozpin's office. To find that Ozpin was already there.

Ozpin sees Y/n enter.

Ozpin: Y/n. No doubt this isn't a social visit.

Y/n: Correct. The Sun Maw aren't here to visit. They are hunting a siren.

Ozpin: A siren? That's unusual.

Y/n: They believe a vampire aids them.

Ozpin: Hmm. An Intresting situation.

Y/n: A dangerous one.

Ozpin: Indeed.

Y/n: I will need help.

Ozpin: I do suppose I can come up with something.

Suddenly miss Goodwitch comes up the elevator and rushes into the room.

Goodwitch: Ozpin!

Ozpin: What is it?

Goodwitch: A student has been murdered!

Y/n: *quietly* Oh no.

The trio go to the site. The dead body lays on the ground behind the dorm, a female drained of blood.

Y/n: This is a work of a vampire.

Ozpin: No doubt.

Arwin and his Sun Maw knights appear and rapidly approach.

Arwin: We came as soon as we were informed!

Misae: A vampire attack?

Y/n: Without a doubt.

Ozpin: Y/n, perhaps you should leave.

Y/n: No need. They know who I am.

Arwin: Wait. Ozpin, you knew there was a vampire here?

Ozpin: Y/n, yes. The one that did this, no.

Arwin: What do we know about this?

Y/n: You mentioned a siren. The siren lured the student out, took them behind here; and then the vampire struck.

Arwin: Makes sense to me.  Cara, Craig.

The twins approach Arwin. Despite being opposite sexes, they look almost identical.

Arwin: You two secure the area. Find that vampire's nest.

The twins nod and walk away.

Y/n: This needs to end, quickly. 

Ozpin: Agreed. I dread this phone call I have to make.

Y/n: I will deal with this vampire, personally.

Arwin: How will you find the nest?

Y/n: He's a coward. Cowards hide where you are least likely to find them.  When the siren goes to feed the vampire. They will find only me.

Arwin: I want that Siren. Bring me the body.

Y/n: Very well.

Y/n walks away. He now knows what kind of vampire he is dealing with. Which helps him narrow his search area.

He looks in the most hidden areas. Even nearby caves. But one place he almost never thought to look, was the dorms.  It made sense when he thought about it.

Unluckily for the vampire involved. He smelled fresh blood. So he followed the scent.

Y/n finds the source. He prepares his weapon as he knocks on the dorm door.

He gets no answer. He kicks the door open to see an almost empty room without the lights on.

Y/n walks in and can still smell blood.

Y/n: You can't hide from me. I can smell you.

Y/n hears fast moving footsteps and dodges a swipe from claws. He sees the vampire try and dash out the door. Y/n intercepts them and throws them back into the dorm room.

Y/n: You took a life. And you expect to run away? You made a choice. Now deal with the consequences.

Vampire: *hisses* Why do you care?! Human pigs are nothing more than livestock.

Y/n: You wouldn't care, even if I told you. 

Y/n shoots a spear of blood. Piercing the vampire's neck. The surprised vampire gurgles as blood comes out of his mouth.

Y/n: This is the fate of all those like you. To be destroyed.

Y/n approaches and with one swing of his bludgeon, he caves in the skull of the vampire. 

Y/n walks out and closes the door. After informing Ozpin of the dead vampire. He waits for the siren.

That night the siren can be seen trying to lead a new victim. But as she turned around, she noticed that her victim was gone.

Siren: What the?!

Y/n appears in front of her.

Y/n: You made a fatal mistake.

Siren: You aren't Luke!

Y/n: That was his name? Pity that he was a coward.

Siren: You...killed him?!

Y/n: And I'm going to kill you.

Siren: Wait! I...I...I can get you blood! That's what you want, right?

Y/n laughs.

Y/n: I am not a usual vampire. But I do love some poetic justice.

With great speed Y/n grabs the Siren and pins her to the wall.

Siren: No! Please don't!

Y/n: I wonder if the victim pleaded for her life. Like you are doing right now.  Just like Luke made his choice, you did too. Now face the consequences!

Y/n grabs the siren and plunges his fangs into her neck. She couldn't make much of a sound from it as she felt Y/n draining her blood.

Moments later the Siren is drained and killed. He drops the dead Siren in front of Arwin's door and knocks before leaving.

With his job completed. He hopes that the rest of his time here will be quiet. But he knows better than to believe it will.