[Autumn]

I think its sooorta fine with not such along CD? 5 is a bit hardcore.
Its not like ranger or dancer mobility skills where it damages/crits and moves you out of the way, with the additonal condition with needing to set up the field for it.

What I think is however an issue is it not counting as a movement skill. Clumsy, Immobilize, traps, etc. should all effect it. I think that should be the counterplay to it. It should trigger field effects too just as cinder tiles.

You need to consider the best case scenario for this skill and how effective it can be at kiting around, I believe Flip Shot too is also put into spotlight sometimes regarding it's lack of a cooldown. If there was a way to tackle the issue of being able to move upwards to 25-30 or even more tiles at once, consistently and effectively while having access to a semi-global AoE ability still, then that would be ideal.

Expanding Ice isn't really the issue here given that its a staple skill of Verglas, and at that its probably fine due to the damage it deals compared to rapid kick or icicle spear. Perhaps too the issue is not actually Ice Skate and rather some skills that generate so much ice for the Verglas, such as Raging Ice Traps, or Freezing Rune. It's hard to identify at the moment.

We've reached a moment where people will just spam their strongest moves, flip shot and ice skate to gain tremendous distance and never allowing their opponents to touch them. I would settle for a 3 round cooldown if it was a movement skill, but that specific thing is more of a bug than anything else.