Illaio's E needs counterplay

I find this ability ridiculous in the sense that there is ZERO counterplay. Why not just remove the spirit altogether and jump right to instant/gradual 45% damage transfer, slow after 2 sec of grab, and becoming a vessel.

When a grab is successful, the target is basically put into a trial for 30+ seconds. This trial consists of killing 3 tentacles, meanwhile, trying to dodge any of Illaio's attack, AND trying to get as much cs as possible.

The debuff is carried throughout the map, even back to the fountain, which I find extremely ridiculous.

I think it would be better if the target have at least a chance to prevent him/her to become a vessel. I think if the target kills the spirit before the enemy does, then he/she is safe. The damage that the target does to the spirit will not count towards damaging himself/herself.

If there is no counterplay, then the mana and/or CD should be extremely high for how much shit is packed into this ability. Currently, when the target finish off killing 3 tentacles (the ones that spawn obviously since you can't get to the other ones without being super harassed and possibly get another one spawned on top of you while being harassed), Illaio's E is already off CD.