You were running out of a building, away from all the clickers and stalkers. You fall at some point, but can't get up. Suddenly, you can hear a gunshot and a zombie fall down. There were more until it was silent, and the person started walking to you. As you looked up at him, you saw he had mid length brown hair with a bit of grey in there. He had a mask on and was helping you up.

"Are you hurt? Did you get bit?" The man asked having a slight Texan accent

You couldn't tell him you got bit or that you were immune, you believed he'd take you to the scientists.