You open the door and let him in…
“Thank you!” the man says as he runs inside and locks the door behind him.
Outside, the zombies are now trying to get inside.
“I don’t think those windows will keep them out for long,” the man says. “We’re going to have to make a run for it.”
“Yeah,” you say. “Thanks to you.”
“Didn’t have much of a choice,” he says. He sees your gun and asks, “Do you know how to use that?”
“Yes,” you say.
“I’m a cop,” the man says. “I promise our chances of surviving this will be better if you give me the gun.”