https://imgur.com/a/vjukHkF

Description says it should apply -20% movement speed debuff but apparently only skill addons are applied during combat (tested PvE, don't know yet about PvP)

https://imgur.com/a/mwScz6g

Also description doesn't say it's a pvp effect which is why I found this behavior to be a bug.

Separately applying movement speed debuffs on other skills among this shows it's not appying correctly

Update: Tested in PvP on battle arena, both scarecrows and adventurers, won't get the debuff applied to them so it's obviously an issue, it only applies addons.

Update:
There's something about the description which is giving bad impression of how to use the skill, and it is infact applied when held for sufficient time (as another player pointed it out to me, otherwise I wouldn't know).

About that - You have to hold the attack for certain amount of time (I'm assuming 2-3 seconds) to get the debuff applied properly.

There's minimal visual cue for it, and the description states nothing about it.. so a clarification would be greatly appreciated / altering the skill's text to make it less of a guessing game.

Also, because of targeting issues (top bar monster/player display+debuffs), sometimes it won't update until you make a hit on monsters, so you get to see it either in time after "looking" at other mobs, or hitting the mob.

Thank you for paying attention to this matter.