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Soraka Goes Mid
I was in a game wherein Riven had a Guardian Angel and was killed while in the middle of using her Broken Wings ability. Her "Invulnerable" status came up with her timer for GA to activate, but she was still spinning around hitting people with her ability for a couple of seconds afterwards. I'm not sure if this happens on other champions as well, but Guardian Angel should be checked to make sure that abilities stop when champions with it are killed.