My guess is the "warmer" temperature was due in part to activity of gut bacteria inside the predator shark
Could be that, as well, but you’d think the researchers would be able to determine that. That a first attacking shark snagged the sensor and immediately dove deep, it could happen, but I have a harder time thinking that from one shark to another shark would cause mammalian-like temperature change that quickly. My dad spent most of his life fishing the open deep sea. He always said the ocean is loaded with critters nobody’s discovered yet. {^) And he was serious, and I believe him.