assuming I understand what you're asking correctly. afaik it goes
gem cast vs prevent. if gem gets prevented it never happened.
if gem doesn't get prevented you then get gem vs 0.x% to multi. so if 1 gem gets through 1-4 gems can be coming at you but if you prevent the first one no others will follow.
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tinyurl.com/nodsacademy
The link to the official forums thread for Nod's Blazing Academy. more useful info being added to it by the day.
Let me try to rephrase, not at all what I was trying to say. If the toon using the prevent gems has double cast gear, does the double cast affect prevents. Can the prevents trigger twice as a result of the double cast gear?
Double casting only happens when you, the caster, use a gem. Triggers won't activate it.
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Computing the probability that at least one of the following events will occur:
P(a or b ... or z) = 1 - P(!a and !b ... and !z) Probability