It's the scene where Catwoman has the Ice Princess tied to a chair. Batman headbutts Catwoman in the head. She puts her hands on his shoulders and you hear a hit (maybe a kick), but you don't see it. Batman falls backwards. Did she knee him in the crotch?
I looked in the script, and it doesn't say anything as to what she did.
I'll re watch the scene and take a look, but I hope so.