Yeah! I confirm it's like halfstep tbh.
But I think it's more like an acrobatic cancel, then + add a Slash shot.
If you watch it slowly at 0.25 speed you will see that the move cancels the acrobatics. Then + add slash shot, how to do that combo. Early K-style. I saw it doing it, but now I don't see anyone using it anymore. Have you used it yet?
And where have you seen it?
How do you do it?