Will have just recently found out about his death in canon and is not to happy about that. The lack of powers will only make it worse because that's also something bad that happens to him in canon! Basically he'll be one step away from a breakdown because he doesn't even know how to deal with getting his powers taken away in way that isn't destructive to himself and others. Is there a "people who can't cope with power loss" support group?

Either way, after he stops throwing a fit about it he's going to be really angry and determined to get his bending back at any cost.