Well, you can't set loose a little fireworks display like that and expect it not to hold his interest. Actually, no, you totally can, he just elected to remain since he decided his intrigue trumped his desire to get the hell outta the general vicinity. Also because he's still recuperatin' after his latest string of shortcuts, and he's a bit too tired to nip out just now. So he doesn't.

"Good point," says Sans, the lights in his eyesockets glittering. That might just be them catching the light of the lingering flames, however. It's hard to tell with him. "Guess it's a good thing none of these chumps were workin' for us, huh?"

He nudges some of the charred remains with a toe of his slipper, winking.

"'Cause they just got fired."