Stun?

I've used Thunder Storm several times, and is it me or do the monsters hit by this attack stop doing stuff for a few seconds?

I thought that was obvious.... Isn't that the point of area of effect skills?

Yeah, but they were still not doing anything even after the effect frames were gone.

There's usually a delay, but that's probably a server-sided glitch. (Or maybe a graphical glitch causing sudden deactivation?)

Also, does Ice Storm actually knockback enemies or just stun enemies like Fire and Thunder Storm?

I think Ice Storm stuns. I don't have a Crystal Deer, but I have seen it being used to stun.

Ice storm stuns, no effect on knockdown gauge.