Henry will be very confused and almost horrified at having magic. This could go one of two ways. He will either enjoy magic and accept and understand it better, or it will make him hate it even more. We'll have to wait and see I think.

James will be in his element loving the fire power. Not so happy at losing his wand but someone's going to need to have a fire extinguisher on hand. Once he controls it though, things might calm down.

COME AT ME BROS!