As usual, ridiculous Mary Sue overpowering of female character
The jumping-on-the-head-of-guys move that she does looks as ridiculous as bad Hong Kong wire-fu.
And as soon as she started fighting the knife guy at the end, I groaned, because I knew what was coming: the Mary Sue moment where a skinny girl takes out a trained male fighter with greater muscle mass. Utterly ludicrous.
In real life, a trained male fighter would have destroyed her easily, no matter how much training she's had. Male strength advantage not only makes men vastly more powerful, but quicker too (something films try to wish away).