"You can feel the difference? But that's fascinating," Hermione blurts, too interested to pay any heed to the restraints of politeness before she has to ask questions. "What sort of feeling is it? Er- if you don't mind, that is. There's some documentation of that kind of sense in my world, but only certain wizards are closely attuned to it, and the rest of us only pick something up when magic is very Dark or very- well, very strong."

Nothing like what she was doing, in other words.