It's a cruel irony that the Prince's appearance is actually serendipitous for Peridot. She had been about two seconds off of straight up assaulting Sans in an effort to keep him from murdering Lambert, and then she'd REALLY be in the shit. The appearance of the High Fae startles her into dropping her dragon guise with a strangled gasp.

Fortunately, she's not super high up in the air at this point, but she still drops to the ground from a height that would surely have injured most humans. It doesn't even faze her; she's up and scrambling onto the scene on all fours. She skids to a halt through the mud to land between Lambert and the Prince, standing up straight and flinging her arms out in a prohibitive gesture.

"I don't know how to explain it yet, but I can assure you that this is all just a big, BIG misunderstanding," the gem wheezes. It has to be.