Crouching > Kick, right?
I was fighting and naturally thought crouching would be a counter to kick. The kick flew over my head, but I still got hit?
Kick isn't meant to be spammed, but in the odd case it is, it is...effective? Well effective in the sense that it will never miss.
Why not make it simply that crouch negates kicks? If someone is able to crouch it obviously means he wont be knocked down/stunned from it in the first place.
Crouch already has a penalty to it already, but the fast kick literally has none being it is so fast.