Then there was something about Professor Quirrell, everyone saw him as a cowardly teacher that fainted while running from trolls, stuttering his way inconsistently through any and everything, but Hermione saw something in his eyes. Steel was hiding behind stutters, he was hiding something, something that would get him killed if anyone ever found out, and it was very possible it had something to do with the same warm feeling she tended to get around Harry. It wasn't possible, but somehow it was.