Really, captain? Putting all your weight into a punch? If she wasn't busy acting out of reflex Isidor might have smirked.

Isidor shifts her feet, stepping backwards out of Jim's strike and then quickly stepping to the side. Grabbing his arm on her way to his outside, she sets her foot in front of his and tries to twist his arm behind his back. If she can just do that it should be easy enough to throw him off his feet.