untechable knockdown stun?

[MuffinMan123]

is there such a thing in SC5?

I saw this stun in SCLS, and was wondering if I have seen this stun in SC5 before, can't seem to remember any character doing this stun ever except in the KO animation. is there any character that can do this stun? which moves can do this?
enemy can't seem to tech out, and can only stand up and block the next followup. if this is in SC5, is this techable? how many frames are you stuck in the stun before you can recover by either teching or standing up and block?

 

[mkl]

Lots of people have it but they are pretty specific. Off hand Yoshi has 2A+B which will ground stun an airborne opponent after 1K~G or if they're just jumping (sometimes good to beat people trying to jump iMCF).

 

[Sandman]

Viola's 2A+B as part of her standard launch combo gives the same stun.

 

[MuffinMan123]

so that stun is indeed untechable? great