"Patroni," William corrected absently. Emotive, that was the key term. His mongoose - and Pete's lion, apparently - were picking up on things from them, and reacting accordingly. Physically.
William wasn't sure he was particularly crazy about that idea.
"You want to go out there," he hazarded eventually, breaking out of his thoughts to see Pete focused on the door. He was even less crazy about that idea, but he supposed it ought to be done. They just needed to be careful about who they met and keeping their emotions in check.
His mongoose leapt from the floor to perch on the lion's back, tail outstretched for balance, clearly ready to go exploring.
"Huh," William said, taking in the spectacle. "I wonder if your Patronus is going to try to have sex with Ryland's."