Professor Vindictus' clapping reminded Kennedy of his old muggle school days, where his elementary teacher would clap to get the students' attention. Meh, it worked in this case too.

Kennedy walked across the grass and stood left to a broom and rolled his shoulders a bit. He's missed flying so much. He hasn't flown since...July? Daaaang. That was a long time and this young man needed to fly...like pronto.