If you watch the clip below, it will become apparent very quickly why this combo might actually be broken and probably needs nerfs before launch. There are no counter hits or special requirements needed to earn the effects of this combo string either. What we're seeing here, according to rahat, is a natural combo - which means it cannot be blocked midway through. What we do know, though, is that this is apparently just a standard combo string.

Now, we aren't quite sure what the notation of this combo string is, but from the footage, it looks like it's a simple one to perform.