He hugs back- rather tightly. Truth is, he's missed Frisk. He's missed them so much. And they're okay. They're here. They aren't hurt. At least not physically. That's a start. They can discuss the more emotional hurdles-

Oh.

Cracks. That's not good.

"FRISK, IT'S OKAY! IT'S NOT YOUR FAULT, ALTHOUGH... PERHAPS WE SHOULD GET READY TO VACATE THIS MEMORY BEFORE WE GET LOST IN SPACE."