take prisoner bugged it ignored iron will from hero ability

while playing against sl a Flagellum of Chains ran up to a weakened Moragen the Lost and after being cleansed used the take prisoner ability on her and she was possessed

 

It also possesses a champion PERMANENTLY.

 

That's not actually a bug.

 

Oh, you are right! It's just that when I was in game I saw a timer for Possessed that went negative and never went away, so I thought it was a timer bug.