When Peter pulls them to the surface, Stiles coughs and sputters, pushing water and matted down hair from his face as he twists around in Peter's hold to look back at the water.

"Five of them?!" he replies, voice a little shrill. "And I'm fine, I'm fine. Nothing a warm fire and some hot cocoa won't fix later," he says and immediately starts rooting through his soaked-through bag. If they can at least capture one of them- dead or alive, it doesn't really matter- they'll have what they came for. The others, well, they just tried to kill him. They can go die in a fire.

What Stiles pulls out is a few vials, two of which he shoves into Peter's hand. "This will make the water temporarily poisonous to them, they'll try to get out of it to save themselves." Temporary, because even Stiles is not above polluting the ocean just to get what they want, but he doesn't want to actually destroy it completely.

"Once they're out of the water, they'll be more vulnerable to attack."