You turn to the ghost and say, "We've gotta get somewhere safe. Come with us. Talk along the way, if you want."
Looking at all the blood on his clothing, you can tell he didn't die peacefully. Your heart hurts for him, and you don't even know him.
"Fine. But I think there are some of those...things back that way," the boy says. He points north. The exact direction you and Ava were heading. Maybe there's another way to the compound.