Originally Posted by nonmortuus
From what I have seen it is because:
You cast your 1st FB
You start casting your 2nd FB
Your 1st FB crits (great) but your 2nd FB has already been cast and is on its way to the boss/dummie/whatever
You hit Inferno Blast but your 2nd FB hits the boss just before you do and it doesn't crit so you lose your '1st' crit.
I have found that I have to stop casting FB as soon as I get heating up to avoid the following FB hitting and not critting. so I cast FB, Crit I stop casting FB immediately and hit IB to get the Pyro.
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We spent some time on the target dummies yesterday trying to figure out exactly what was going on here.
This happens when you are less than GCD * FB/PB travel time from your target. If your bolt reaches the target before you can use IB, then you will experience the problem. If you stand right next to a target dummy then the problem is quite noticeable. But if you move back a bit, past the point where your GCD ends before the bolt spell reaches the target, then the problem will go away. The problem resurfaces if you move out to max range (two GCD's out).
The exact distance depends on the travel speed of bolt spells, which I know is standardized but I don't know the exact value, as well as your GCD duration which depends upon your current haste. From trial and error it seems that a distance of around 20 yards is in the middle of the safe zone.
It seems like a simple computation that could easily be accounted for in an addon or a custom Weak Aura setting - presuming you know the standard flight speed of our bolt spells. I know I saw that information recently but have not been able to find it.