Sam grimaced. He knew most of the older teens weren't fans of that rule at all, and he couldn't rightly blame them. Didn't mean he didn't feel better knowing that they were safe behind walls, though, even if he was well aware that most of them were well able to be more useful than they were. And more than willing.
"Well, you'd be stuck here for a while regardless," he pointed out mildly. "Don't risk lettin' new folks go in an' out 'til we're sure of them good and proper." He doubted he had to explain why to the boy, he'd come from out there. "But after that, we've got a few teams that go out on schedules an' get what we need, an' there's...well, there's just no reason for any more folks than needed to deal with what's out there. An' there's plenty in here to keep folks busy without any need to go past the wall."