Neat skill idea: Spirit Bomb (works like the Seeker Missile from Starcraft 2)

Anyone here a Starcraft 2 player? Ever use the Terran Raven's Seeker Missile? If so, you probably know what I'm getting at. If not...

Here's a rough outline of how it works:

Creates a missile that hovers in the air and locks onto a target enemy over a short time. If the target does not move a certain distance away from the missile before it finishes its wind-up, the missile flies at the target (it's undodgeable now) and explodes on impact, dealing heavy splash damage. If the target does move out of range before the wind-up finishes, the missile disarms and does nothing.

In a game like League where counterplay is loved, this would be the great start of a skill. Basically, you generate a floating bomb that over, say 1.5 seconds, locks onto your target. If your target doesn't get away from the bomb within that 1.5 second window, it'll smack them for TONS OF DAMAGE. If they DO run away from the bomb, it does nothing.

Say you use it when being chased. Does your opponent break off to avoid getting smacked in the face (which could include a slow or some CC), or does he risk the hit and chase you? Loads of decision-making fun to be had.