[Gameplay] Kalista attacks and kills while on Guardian Angel**(not Archangels) buff resurection

Hello.

I was playing a game today and came across a bug, at least i think it is, any way. there was a little fight at bot river all was going fine until i killed Kalista, not fully obv cause she had Guardian Angels buff on her, anyway she started to resurrect as always but then i realized that my hp is dropping and that she is attacking me while ressing. unless its her magical power i have no explanation for what happened and i also tried to finish her but my spear went right through as if she wasn't there. here is a short Video i recorded to show you what happens i slowed it down as much as i could to help you see all the actions.

https://www.youtube.com/watch?v=KGCllcRWmU0&feature=youtu.be

My bad i messed up the items.