What if Fizz's ult knocked him up too?

(keep in mind im just a player and not a pro game dev) and maybe also damage to himself? So if hes also in the aoe range he would also take damage and/or get knocked up, that way if you get hit by it, you can turn the tables on fizz by using his own weapon against him by running into him. The damage he took from the ult would count as damage from whoever it is attached to (if its attached to nobody and it kills him then he would be executed, same circumstances as when an enemy tower kills you)

example:

is at low health lands his ult on dives to bringing him into his ults aoe range ult goes off dies

gets the kill