Just to be clear I think there is some confusion about the difference between GCD and the recast timer.
The GCD is the period where you can not start casting a spell because it is greyed out after a cast. Hitting the instant click item doesn't do anything other than "ungrey" the top gem slot, which will allow you to start casting it again. **NOTE that the ability to start casting the spell doesn't give you the ability to finish casting the spell**
The recast time is the minimum amount of time between finishing casting a spell twice. When you cast a spell the recast timer begins ticking when you finish casting. The check is made when you finish the second casting. If the timer value on the finish of the second casting is less than the recast timer then the spell will work, else you get the spell error.
The result appears to be that if you have a spell with less than the GCD as the recast timer you can chain cast it, but this only actually happens AS LONG AS WHEN YOU FINISH CASTING THE RECAST TIMER IS MET. This is why if you try to "chain cast" a fast casting spell (try Tashanian) you'll get the error message: spell cast is 1 which means you'll finish your second casting before the recast timer is met (2.25 secs for tash) and get the error.
In other words you can't ever beat the recast timer check unless there is a bug floating around that I don't see.
In the example of dementia:
The spell cast time is 6
The recast time is 8
When you load the spell into first slot it is greyed out for 8 seconds then you can cast.
If you hit the instant cast item it will ungrey and you can begin casting it right away, but you get the error. (0 seconds waiting + 6 second cast = 6 seconds (recast timer check fails >>> spell doesn't work)
You need to wait 2 seconds. Waiting 2 seconds + 6 second cast = 8 seconds (recast timer check succeeds and spell will work).
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