Playing around interrupt aren't exactly all sunshine and daisies. Due to the delay problem caused by chase chains, if you wait too long you might end up unable to cast, or worse, screw up your next round's action due to the cast attempt.

There are potential solutions, but it either gets really complicated from both a programming and usage perspective or would cause significant delays in battle, which is simply not viable if you consider GNW--We are not the most populous server and yet we have experienced time outs. A delay before every mystery will see every GNW battle of more than 2 squads on each side end up in time out.

I have proposed a rather complicated automatic response casting queue before but... that's just complicated.

On a side note, due to the popularity of immunity ninja like Roshi, as well as a number of mass cleanse ninjas, now CC frequently work like interrupts, because the CC aren't going to *. So this is really becoming more and more of a problem.