Just weighing in for a bit because we wouldn't want you to be factually wrong, would we? ... Entei is pretty much instant judging by the mangaFunny, I could have sworn he used it at TB. Entei has some casting time, so Luffy just has to go into G2 and hit him before he can use it. Also, CoA provides fire resistance since Luffy didn't even show any signs of pain when he used Red Hawk. Entei could only cover 1/4 of a very small island. They more or less have the same destructive power.
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