And by the time you're supposed to have gotten him there, he will have moved away from it.
Seriously, you need more than 0.33 attack speed if you want to be able to make the displace factor of this skill higher than the enemies movespeed. LEARN TO COUNT.
Let's combo Dark Abyss with a common combo skill, let's say Storm Bolt. Disables for two seconds, yes?
Now, how many hits could he get in in the period of two seconds? Three, maybe even four. 400 range.
400 range is equal to level 1 hook. Yeah, powerful. [/sarcasm]