Guild Wars 2

I found a few 2-3 month old threads about this but nothing new. Here is video proof that UA will miss when you are slowed.

I also tested, but forgot to record, a scenario where you have slow for only a portion of using UA. The skill will miss while you are slowed, but then will start hitting as soon as slow is gone (say you were slowed by well of action for 3 sec, the last 4 of 7 hits will connect, but not the first 3 when you were slowed)