Lalo, of course, can't help but feel him tense up a little, but he can also tell Levi is trying to suppress it, so he doesn't mention it. He does file the information away for later, though. But it makes sense that a child soldier would be jumpy at being unexpectedly touched.

"So what brought you down here?" For all Lalo knows, Levi came here for the same reason he did. That, too, would make sense for a child soldier.