Sans is a pretty chill guy, all told. It's hard to get people to believe he's even remotely a threat, and that's all well and to the good. He prefers not bein' much of a threat at all. So he tosses Sato a cheerful wave, showin' next to no indication that he's the source of the large chunk of rubble that goes flying into yet another window in the same moment.

"Oh, nothin' much. 'Sup?"