Jonathan had had a completely different reaction to the observation that two twins had just been Sorted (and into different Houses, no less). He was wondering, as he picked up the Sorting Hat, whether magical twins had any unusual properties, like being able to feel each others" pain and the like. He'd heard stories, of course, but he'd never actually met any, and so he wasn't sure if those stories were based in truth like Babbitty Rabbit (who was obviously an Animagus) or completely crazy like the Three Brothers (who had met Death, yeah, right).