Yeah i think its in both versions. In a real match its very viable. It hits me all the time cause i use a spacing character. I will back dash and do nothing. Ive seen algols spam 4bk twice in arow, This is why. I used to use algol and would spam 4bk twice. But i didnt know why it was effective.
Im sure you have been caught by this before, im pretty sure everyoen has. You have that moment where you like i wasnt backdashing :)
The move is supposed to only catch you if you backdash during the start of 4BK's animation. But it has a 2nd function that i dont think anyone knows about. If you backdash during the end of the animation It locks you into 4BK if you dont press a button right away.