Seeing Lara is always a nice treat, and Sans' expression is easy when he turns to her. It doesn't last long, not when he first glimpses the stricken arrangement of her features. Mind racing, he tries to put the pieces together. How would the Sans here before him react?

Drawn eyebrows, shaky steps, hesitance -- sadness? No, fear. Surprise. Wariness? Like she's looking at a ghost, and not one she expected to see. It doesn't add up, unless...

Nah. Couldn't be.

"Heh, you okay, L?" Grief. Had to be grief. Hopefully not a grief he's supposed to know about already. "Nobody died, right?"

He's only half joking.