Peter didn't ask a question, no, and that's on him, so as far as he's concerned, Stiles is in the right to ask him to elaborate further. And to be honest, Stiles' whole deal is so baffling to him, be doesn't really know where he would even start with questions, so it's probably for the best he lets Stiles take the lead for now.

"It was an experiment in cross-species genetics. Mixing spider DNA with human DNA, to try to find ways to give people some of the enhanced abilities that spiders have. Oscorp did similar experiments with lizards, too, which, uh. Led to the last giant lizard person I fought, actually."

Ok. His turn for a question.

"How does the mountain ash thing work, exactly? Like, it doesn't make any sense."