"I mean, that'll work, too."

Whatever keeps you sane in an insane place. Sam eyes the stranger and his shifting expression. When the guy introduces himself, the younger Winchester offers his own hand, shaking firmly.

"Sam Winchester. Nice to meet you, Billy." There's something below the surface of this guy, but he's not exactly sure what it is, yet. "Where'd you come from, right before this? If you don't mind my asking."

It'll almost definitely offer some insight into Billy's demeanor... unless he lies.