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Yea, I personally like to use Scathe instead of Blizz 1 like in that one rotation.
Blizzard is strictly better but Scathe lets you move earlier. Really, the ideal one is not having to cast anything. Getting out of Umbral in one GCD is the best option.
Edit: BUT, it's like ... not even relevant at all really? Just don't do nothing is all that really matters. Something about ABCs.
If it's super lazy, I don't even apply the previous rule, I will cast all the Fire Is, then Blizzard 3, and then just wait for the mana tick to allow me to cast Thunder 3.
This is the best of those listed lazy options. Losing that one Fire cast is something like a 10+% loss outright? Waiting a tick in UI3 and getting T3 instead of T1B1 isn't a huge deal.
Oh god somehow FCCCCoB has become synonymous with GAF PVE Stuff.
What a strange world we live in.
It's like the worst possible outcome. We're on a Bad End route.