OK, unfortunately this skill seems absolutely broken for me.
I’m not even sure why in here it a) deals no damage (no hit at all) and b) once I use it, I cannot move until I use another (attack) skill.
In your second video, what’s happening is you’re unable to use Dancing Strikes because it requires you to be dual wielding, but instead of telling you that, it incorrectly plays an animation and locks you in place. We have a fix for that internally, although it may not make it into an upcoming hotfix.
I’m not sure what happened in the first video, but your description is accurate, there’s some sort of foul bug at play. I’ll look into it. If you have any more information or find a way to recreate the bug, let me know.