Obviously. [ Wu repeats with mocking disdain in his voice.

He eyes Mako, having completely set aside the man who is being completely unhelpful in every possible way. Wu was trying to help him! And he gets nothing for his efforts. Nothing! ]

A freak accident. I don't think so. I think you're a firebender and at your age you should certainly know how to control it! Isn't that, like, firebending 101?!