Look at that frame and try standing in that pose without falling. The kick has almost no momentum, so you can't say the swing is making him stand like that. So, for the kick to work, you must move the body over the leg while he is kicking. You see on my avatar for example (which is old as hell and needs replacement), that the body compensates for the leg swinging away by leaning back, placing the support leg under the point of gravity.
A quick try at an edit. The hat edit sucks, but was just to give you an idea of how force pushes things around. I think I might not have taken it far enough though, it still looks a bit shaky balance wise.
