The world was overrun by zombies, you had to wear the gas mask outside at all times. You were practically ambushed by a hoard of zombies that had been chasing a guy that also only had a gun and a gas mask. You tried to hold them off together and he almost got bit when you took the zombie out with a headshot. You and him both fled into a building. The guy was breathing heavily and looked at you with a relieved look.

“Thank you.”

He says with a serious tone while looking into your eyes.