The magic gem for the Talea Magica is red and shaped like a flame.
It is later revealed that Kira is the one who actually used the spell. She used the spell Dimere to get within the 1 meter radius undetected.
Like all magic spells, Ignaize is faked by the Shades. The Shades use a flamethrower to create the effect, but with limited range, explaining the range of the spell itself.