He was pretty much dying to see a whole zoo (or three) packed into the Hogwarts halls. Accordingly, his lion gathered its muscles and sprang ahead, rounding the corner (mongoose still balanced on its back) while Pete and William were still only halfway down the corridor.
It didn't really occur to Pete that this would be a problem until the screaming started. "Um," he said, and half-faltered in his step before quickening his pace. "Well."