User blog comment:Jkphantom9/RWBY clip on Lazer Team Livestream/@comment-10390252-20140622203241/@comment-11188061-20140623081520

I can't actually hear it, but you suspect that as well? It may be that she magnetized her hand (or the armor inside it, whatever) so that when she was trying to pull off the combo, her polarity saved her and pulled her hand towards Mercury's leg weapon instead to block the blow.