Good point about stealing vs. removing. I think your guess is right. I know in the options on the homescreen in the upper right, there are descriptions, I havent read the perf. immunity one in a long time. I will give it a re-read.
There are so many things to remember now, plus, sometimes the description for talis or passives are a little vague. But I understand what you're saying. Whenever something new happens, we gotta read the news feeds, LOTB tuning updates and event release info, check the challenges & achievement screens... then proceed with event. It's good to get prepared before rushing into things. As far as peeps on Facebook (B!tchbook).... I'm not even going to talk about it. LoL