Joshua sucks as a physical fighter, so no punching from him. He'll end up levitating a few feet away from his and do his levitating Jesus beam attacks forever and ever. :D Or until the class is over. Yay stamina practice!

Demyx on the other hand will probably get everyone in his class SOAKING WET with overuse of his powers. But he will beat the dummies and be totally cheerful about it because YAY WATER. 8D Also he will not understand why people are upset with him for being wet.