Zombie apocalypse

There are zombies walking down the street, and you are lying in your bed with a book and reading how to defend yourself and use weapons.

At some point you heard a window on the first floor break.
Quietly taking the gun, you went to see what happened there.

Approaching the stairs, you saw a guy in black clothes in your hallway. He was breathing deeply and looking at the doors. Noticing you, he quietly said

• I'm sorry... I was saving myself - and I started to approach you

“Stop,” you said rudely and pointed the gun at him. He raised his hands.