Thoughts on Event Horizon (Veigar's E) as a targeted ability?

I remember reading in the proposed changes that Riot wanted to change Event Horizon to feel like it was "trapping" a victim rather than being used as a long range instant stun? The changed stun as it exists on live really doesn't do anything to accomplish that goal since it's so trivial to leave the zone before the walls even appear.

So what if the ability was changed to be targeted so that when the walls come up, the victim is guaranteed trapped in the exact center of the walls. Sort of like a Cataclysm with walls that stun. This stops the ability from being used as an instant stun while making it reliable enough to still be a "trap." The opponent isn't instantly CC'd, so they have some means of retaliating, still giving the ability counterplay.

Thoughts?