system
Given the following post, respond as if you're commenting on Reddit:
human
[Fullmetal Alchemist] [spoilers] What's so secret about 'the secrets of Flame Alchemy'?

So in Brotherhood, there's a lot of buzz about the **Secrets of Flame Alchemy** and **Nobody must Ever Know** and **I Have the Secret Tattooed on my Back** and all that pizzazz. But the so-called 'secrets' basically just amount to 'flint glove - transmutation circle - transmute the air - snap fingers.' What's the big deal?
gpt
The specific alchemical formula to make that chemical reaction and manipulate the result. Mustang doesn't just make things combust, he can control the size, power and field of his flames. Remember when Mustang instantly incinerated dozens of zombies without harming Ed?  Power and control on a massive scale, whenever and wherever he wants, at the snap of his fingers. He could single-handedly wipe out an entire army. It's an extremely deadly weapon that only he possesses. Like, imagine if you were the only guy on earth who knew how to make and use gunpowder, that'd be a big fucking deal, even though it's just a bunch of charcoal and sulfur.