Because he had decided to go for bigger rather than stronger the bounce spell she casts doesn't keep her from getting burned. Bringing an arm up she hisses, eyes tearing as she feels the pain feather out, because she couldn't completely stop it. Whatever. It's fine. She'll deal with it later. "I don't know you tell me." Since it's now heading back in his direction. Not to mention she's going to fire off a similar spell, so he'll have to worry about deflecting it twice! Pew pew!