Illaoi bug?

I want to ask cause, although I searched it, I am not sure if this is a bug. So, I play league and fight against Illaoi. She e me and she ults. I kill her while she ults, before my "idol" was killed (by idol I mean her e). And although she is dead, the tentacles of her ult still hits, me and my idol. After 1-2 seconds she is dead, the tentacles kill my idol (and damage me of course) and then her passive triggers, spawning one tentacle that hits me without showing me its hitbox. Are these normal? Her ult and her passive work while she is dead? And if this isn't normal can I somehow upload the replay to see it?