The boy enjoyed the bit of the cookie, seeming completely satisfied with her place on the ground. However, as with most things, he couldn't enjoy it for long. "Mabel!" He couldn't help but stumble, his knee and then ankle starting to give out on him with that first kick. He might not have been in the best shape of his life, but he was never unhealthy and thought that his legs would've been a bit more sturdy after running up and down stairs all day. He quickly decided that he had just been caught off guard, though he knew better than that.
Once he regained some sort of balance, he kicked some snow at her, and then immediately started walking back toward the castle. He wasn't going to wait around for her to trip him again. "Bugger off, I'm going back in!" Mitchell grumbled, not worried about picking up the fallen cookie plate. The groundskeeper or some house elf was likely to grab it later.