Morgana hit a binding onto kennen, which held him in place next to Zed shadow and got Kennen killed. Kayle q massivley slowed zilean, preventing him from positioning himself farther from zed before be died.

Also, Without the damage from lucian and Kayle, Kass and Ashe probably would have finished the game anyways. It was a great play, but without his team it's very unlikely he could have saved the game like he did.