I *think* her 4H+K puts them in a stun they can't struggle out of but can hold. It's the same as Jann Lee's 214P or 6P+KP.
Yeah it seems there's 2 sit down stun animations both which don't allow holding out of now. You can see both in the video.
Jann Lee has the same ...
The following cause the 2 sit down stuns with the animation we know:
4P (the start of his Dragon Fire)
H+K
And these cause what looks like a "forced crouch critical stun" just like the one you saw in the kasumi vid.. different animation and no push back. but its essentially like a sit down in every other way (unholdable..whiffs highs.. etc)
214P
6P+KP
Also I found a new stun. To my knowledge right now it only works in the snow stage (need to test it in the water stage to see if the same effect is there).. I had a little time to mess around with the game yesterday with my friend Goro Hazuki and he was using Akira. when he did Akira's 3P+K ..(its the special low P he does in VF)
it was kinda like a slide back trip stun that doesn't allow holding out of. and it also guarantees his 33P launcher.
Its worth noting that it worked both on normal and counter hits...
I like that its a stage specific setup and I haven't tested if other characters have that same stun with certain lows (honestly been so busy with work/college).. but I'll get back to you on that
but it looked interesting
I really like how the game evolved
..