This is Van Helen as Korra, and that fireball she’s throwing around isn’t a simulation or photoshop, it’s the real deal.
The top and bottom shots here were done using a method which basically has the person dip their arm in a (kinda safe) flammable solution then setting it on fire, creating a brief flash of flame.
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The middle shot (so the one immediately below) was done the old-fashioned way, by having someone...stand behind her with a can of hairspray.
Photos and setup by So Say We All.