The only thing I can add is that if you do not spot a roach warren, its pretty much a won game since a switch to blue flame is usually deadly but maybe it's not good to tell you this yet.
Maybe I'm reading this out of context, but queens, spines, mutas and infestors all do really really well against blue flame hellions; you don't have to get a roach warren. People with blue flame often dive into a zerg's base too deep as well. Let them in the gate and then ram those hidden banelings up their backside. Bye-bye hellions.
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