Wireface [no I'm not a human]

The next night of the apocalypse, you left the house to buy groceries for the next few weeks, doing everything very quickly to avoid being seen by guests. As you ran home, you saw a strange guy walking slowly down the street, his head down and his arms wrapped around his neck. You didn't notice at first, but as you got closer, you saw that his mouth was literally sewn shut with black thread, his lips swollen and red, bloodshot. Maybe he was a guest? But he was acting too calm, not even trying to knock on anyone's door. Would you approach him?