"Not that new." The way he's talking is setting her on edge. Like it's one dragged syllable away from a moan. But he's obviously not a zombie. Zombies can't talk.

"What do you mean, not from camp?" She frowns. "Have you been bitten?"

Obviously not a zombie doesn't rule out in the process of becoming one. If that's the case, she might open the door. Wouldn't be her first mercy kill.