Papyrus turns just in time... to catch the incoming human projectile! He whirls them around in a circle around himself, slowing their momentum enough to keep them both from rolling over.

"Frisk! You sound so happy to see me! I understand," he admits, knowing how wonderful it is to be in his presence, "but, I don't want to let you down. The puzzles are incomplete, and you've already solved these ones anyway!!!"

If Frisk is back in Snowdin with him, then they must want to reminisce about the good old days. Solving puzzles, fighting in the haze before Waterfall, those terrible hours where his friendship was the only thing keeping them going...