[@Zarkun]In his defense form, pretty well(he'd only take 2/3rds of the normal damage, plus the thick scale armor providing extra protection), and his lack of pain means he could basically fight through it if he needed to. Fire holds no particular power over him, nor does he hold any weakness to it. His body, while more durable and able to take more of a beating , burns just like any other in his human and speed forms.