Handmaiden Sparring Glitch

[Nidhogg]

Whenever I try to spar the Handmaiden on the Ebon Hawk, niether of us can win. We just keep wailing at each other, each side unable to drop below 1hp, until I get fed up and end it with a force power. This happens every time I try, even after reloading a saved game, but only with the one character. I own an X-Box version of the game, and this has never occured to any of my other characters (although once, with another character, Bao-Dur did 'zombie' on me, and refuse to do anything unless he was the 'active' character). If anyone knows a solution or workaround, that would be great.