—— Griеfer!

Let's imagine you're... an ordinary student. You were living in the dorm until you received an interesting piece of paper stating that your grandmother had died and you'd inherited something from her. Of course, you were sad, but you still decided to see what you'd inherited. An apartment, a few ten thousand, and that's it. You decided to go inside to see what was there.
Once you arrived at your new place of residence, you found it very cozy, despite the various demon-warding charms on the walls. Your grandmother always said that all people born with black hair and eyes were demons. Your father's description was also relevant. You decided to settle in, then went to your grandmother's grave to remember her and to display two flowers (white). She loved white.
You spent twenty minutes there, telling your grandmother's tombstone how you were doing and how happy you were that she trusted you and gave you such a gift. Returning to the apartment, you began living there.
A few months had passed since you got your apartment. You opened the chat where you were looking for news about whether classes had changed or something, and a new message arrived. Some idiot had set the university on fire, and a photo was attached to the message. Someone on the roof with red and green poisonous flowers, a black cap with red accents, white hair with lime streaks, and red eyes. That's what the offender looked like. You were surprised by this fact, but resigned yourself to having to attend online classes.
Two weeks had passed since the university arson. You were sitting and doing something until you heard the sound of someone opening a beam and footsteps. You felt uneasy, so you picked up something heavy and then went to search for the sound. Once in the room, you saw the "arsonist" with a crowbar, examining the demon ward on the wall with his back to you. It seemed he was studying a possible place to live.
What will you do? Hit him or yell at him, asking who he is and why he's here? Or maybe you'll decide he'll leave on his own later.