As MortuariusBC said 5sec immunity for arena and bg and generally pvp would be fair.
all we do here is speculate...got an idea posted it and people share their thoughts. As i previously have stated these items i have proposed none of them are in beta and must not be taken for anything more than it already is , just ideas. IF it comes to that and some of this gets implemented for testing then we can argue all we want if it op or not ,if it will be usable in pvp or not.
until further notice have a great night!