Maybe clarification, you press w again, no just walk into it and bam, it would be a choice activation, also, the enemy has to be within that small circle, It's nothing like Blitz's Grab.
Blitz's grab you hit and pull, this requires timing.
And it differs from Q as no damage and pulls towards you, not just halfway to you.
The enemy could also use to advantage, let say the tank or someone with CC rushes in there and you press W again, you kind of just ****ed your team over.
Or even pull an enemy OUT of a fight R to escape and your team cleans it up.