Help defeating the swamp mosnter in avatar the last airbender burning earth.

Hey guy's, I'm in desperate need of help with avatar the last airbender burning earth I need help on how to throw water blades or whatever their called at the swamp monsters face once I destroy his two arm's. But I'm getting angry >:< because every time I try to shoot the *** **** water blades at his **** face all ang does is just squat up and down I don't understand why he won't shoot the **** water at him someone pleeeese help me.