[ He does consider the possibility of the floating being related to a Stand being used. He glances around for a moment, and thinks he'd probably see something related to a Stand if there was a Stand actively in use. So despite the twitch of his first finger where he'd normally have a pen - an impulse to summon Heaven's Door and use it - he suppresses the desire.

There's magic here, which for the time being, is where his assumptions land. ]

Well, someone I don't like is the easy part. [ He doesn't even really need to think about that. ] But maintaining is a little more challenging. I don't suppose you're about to say to keep thinking about that person you don't like. [ Well, hates. ]