Dob solved the mystery of the weird canceled falcon kick. I tested it even more and an easy way to recreate it. It is unfortunatly not very usefull as it stands now.
This is my post in your topic discussing this:
DoB is right. and as far as I tested you cannot get the strange effect of the falcon kick after your opponent moves away
I also recreated it, and it's quite easy to do, This is how it's easily done:
1 place your opponent almost at the very edge of the stage, with just a little space between the edge of the stage and the opponent.
2 Roll behind the opponent (so you end up between your opponent and the edge) and immediatly falcon kick. This way the opponents 'body' will give you a little push off the stage, wich makes the falcon kick act differently.
An even easier way is to go to training mode, set the cpu to 'controlled' (you need two controllers for this way) then:
1 you (the falcon) must stand at the very edge of the stage
2 let the cpu set to controlled walk you even more off the stage (like give you the final push needed for the wierd FK effect)
I'll test some more to see if I can somehow make it work to get the effect without an opponent right next to giving me the final push.