The effect is instant. Peridot didn't even know Lambert could do something like this, and she's certainly not prepared to resist it. It's like her anger is on a dial, and someone just grabbed that dial and turned it down almost all the way to zero.

She breaks off mid-sentence with a vague look of confusion, and then her fingers relax. Without the active will to keep channeling her magic to her claw-tips, the heat them dies off quickly, sapped away as steam in the rain.

"I'll just make my way back up to the party, then," she mumbles vaguely, and starts to wander off.