Uhhh, panic a little?? His little dog friend has been snuffed out in an instant! He's stabbed by a pain at the impact and loss, some mix of pain across the bond and the sudden exhaustion, but also the spike of fear that his familiar - his closest companion in nearly all his memories - is gone, just like that!?

He does his best to back away from the creature, to stay away from the trees it's toppling; that's an alarming amount of destruction happening there, and his amount of panic is maybe better described as a lottle.

But Papyrus has spent his fair share of time in the ruins studying up, and two can play at that reality bending game - he does his best to change this stuff to his benefit with a little Force Distrust.