(it may have been a fantasy, but that was the first time we saw Ember's fire, and it turned out later to actually be pink, and she is a good judge of Starlight's abilities)
>>1514965s
If the fact that dragons seem to have color-coded magical fire to begin with is any indication (probably not a natural consequence of mundane fire, to cause explosions), I don't think she introduced magic into him where none should have been. However, with the nature of his birth, being magically hatched and grown to a giant right off the bat by Twilight, perhaps it influenced his potential into being more potent than it would've normally been.
~~if it's annoying to use smol thumbnails tell me~~