4 3 2 1 - 1 2 3 4

So each number has their own turn, 1 - 1 roughly go at the same time with the obvious exception to the rule being initiative, then 2 - 2 go, so on & so fourth.
Both sides take turns in that order regardless of where the ninjas are placed, if you have an interrupt in slot 2, you can never land your interrupt on slot 1 that's just the basics of how the mechanics work. Slot 2 can interrupt slot 2 & below, but if slot 2 uses his mystery exactly on his turn, he will go- regardless of initiative & this goes for all numbers below, slot 2 interrupt can't actually interrupt anyone if they use their mystery on their own turn, a perfect way to replicate this & notice it, is with Mei- on Mei's turn she uses her fog to poison, if you use her mystery precisely during this fog she will proceed to use her Mystery & you can't stop it.

To fix it, you'd have to implement some sort of delay & check factor during the point a mystery is used- so the entire board would stop for a split second allowing time for the game to pick up an enemy interrupt.

I could be wrong, but since starting this game all I've done is Arena because it's like the only thing to do & this is basically what I've noticed.

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.