"Huh?" Sans asks reflexively, looking up. The voice is new, but that doesn't necessarily mean anything. He was missing time -- maybe the guy knew him?

No, that was ridiculous. Shuttling that thought away, Sans relaxes quickly into his usual blank grin.

"Uh, not specifically. More mourning an old friend." He explains, gesturing to the spot where the bar used to be. Of course, to someone who wasn't around to know the bar before it disappeared, it looks as if Sans is pointing to the small heap of dust. "I've been sorta out of the loop lately."