Twilight wants to know about the mindset of shapeshifting. Max doesn't like the topic. It reminds him of mistakes. And things he can't forget, no matter how hard he tries.
A young man, who has detached himself from the world is offered a chance to be reborn into a new body and world, in which he could actually have some decent fun.
The Rainbooms aren't CHS's only defense against the supernatural. Unfortunately, the alternative spends more time hanging out in abandoned buildings and landing themselves in detention than is normal for any teenager. At least they enjoy their work.
I remember being a young adult male human once. Nowadays I'm a female pony who now has to retake school because SOMEPONY couldn't perform a spell correctly. I might as well try to make some good out of this situation and see what chaos I can cause!