wave dash
You just need to imagine what would you do in the situation when some setska that you fighting with, wd'ing and getting closer to you.
If you will attack then it means that wd is forcing you to do some action with is good for setska because it give her some opportunities for mind games.
If you will stand and wait with block then it means that wd is forcing you to guarding with is good for setska because it give her some opportunities for mind games.
Any other of your actions also will give her some opportunities for mind games.
So like you see its just a mind games, you can win or you can loose in it. But due to the fact that setsuka have offence (we can say that) and she can change her actions in any situation (for sidestep, block, attack, backdash), she have advantage in this mind game.
It's something like mishima wd, only big differences is lack of fast low for mixup, (but she have throws with is good), and I think that sooner or later setsuka will need it in highest levels of play (just like mishima need it).
Oh, and one more thing. Her 236 214 are not that risky.
If you will get hit during them, it will count as normal hit not counter.