Proposition: Tahm Kench gets TIRED after Eating an Ally Champion to Safety

Similar too Blitzcrank and the way his W works. I'm thinking this would make him more manageable. Sure he gets the ability to save his ally from danger. But he's gonna take a fuck ton of damage for it. And since he's tahm kench anyway, he's probably gonna be able to survive it in teamfight situations. More importantly it isn't a no risk ability anymore. He won't be able to eat and dash.

Just to clarify. I mean to say that after eating someone (ally or enemy) he receives a slow in his movement speed, though I'm not sure of how heavy it should be

I think that it should be the same on his enemies UNLESS he kills the targets. What do you guys think? Will this be some decent counterplay? Is it too much or too little.