Kayle ult... like nothing

I ulted my mate with kayle, but the enemy base laser killed him. The ult sais: prevent all enemy attack for a short duration. Well Tresh just goes there for a half sec with my ult on him and die instantly. And my ult still should be up, i just put at him. He said, laser can still kill anybody. Is it true? then pls mention this in the ability box, if its not, pls reviewe if the ult works wrong :) ty
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