The catching of the foot? 
None that I know of, pretty much every movement made by Kanitah is a reckless gambit with risks and rewards. It's made up as it goes along on my end.

The moving with the foot because Fury has enough strength to upend a city bus and Kanitah only weighs 500 some odd lbs? 
Logic, yo. Kanitah knows that not resisting the weight of each strike landed by either opponent, because neither opponent weighs even a quarter of the maximum output of the other fighter, would result in both parties flying off in the opposite direction. Unless they are holding onto something or matching the force, which Kanitah is attempting to do with the leg catch.