So in this scenario we're assuming max damage is 5%, one combat round happens while casting RoST, no combat round happens while casting GGR, and that the GGR user will cast as soon as the lower-health mob hits 6% and the RoST user will cast as soon as the lower-health mob hits 11%.
In this scenario the GGR user will always have the lower-health mob be under 5%. For the RoST user, looking at my data while charming gators in cazic thule, there was a 57% hit rate: 8029 occurances of "An alligator bites an alligator", and 5877 occurances of "An alligator tries to bite an alligator".
So 43% of the time that combat round that occurs while casting RoST will be a miss, and therefore 43% of the time the RoST user will end up having to kill a mob with 11% hp left, while the GGR user never has to face a mob with more than 6%.
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