Entangling Trap working as intended?

[Dragonbane]

In other MMO's I have played (World of Warcraft), Hunter's traps were used to entangle or ensnare the enemy (as in immobilize them).

In AL, Entangling Trap rogue skill does not slow down or immobilize the enemy in any way.
There is only an upgrade that will have 20% chance to pull the enemy to the trap, it just repositions them slightly. Does not slow down or immobilize them.

Is the intended purpose of this skill just another AOE attack? 20% chance slight repositioning the enemy?

Or was the purpose of this skill to immobilize the enemy temporarily?

[Lojack]

This works for me.
Mobs steps on trap, trap expands, mob has a smoke effect on them and runs slower.
Do you have any of the upgrades?

[sirtibby]

I have trap at 5 and when it pulls the mobs in they stay there for me to mow them down.