Once upon a time, Thor was exiled to Midgard, and spent his time playing the role of the hero.
So his brother Loki - smarting over a few minor squabbles - decided to play the role of the villain.
But the gods are creatures of magic, creatures of story. We must be careful which roles we step into.
The god of mischief became the god of evil.
But Loki didn't care. He was on fire now.
He was burning.