Librarians were going to be pissed in the morning, but frankly - nerd or not - Barty didn't care. If it destroyed the whole library to capture the man then so be it. His steps continued to take him a bit closer to where the man had to be, but oh, that was fire, fire! It was not immediately where he was, but it was close. And also between them and the door. Hmm. Waving his wand, Barty made the flames extend to block the way to the door and shoot the flames even closer. That door was closed.