Uhm I get interrupted a lot while casting longer spells mid battle, I can't say it has to do with or without stoneskin. I just hate when people say "there is no interrupt in this game" then I get hit by a mob and it does the little cancel spell animation. I've had a cure/sac interrupted before, which is sad cause its a small casting time. I'd like gear or something to help us with interruption since it does exist and is obviously a game mechanic and not a glitch.