Discord, the lord of chaos, former spirit of disharmony and agent of misery for ponykind. Ageless being with unlimited powers that nopony can hope to match.
When Sombra aimed his spell at Fluttershy, Discord had a split-decision to make. Take the spell head-on or let his dearest friend suffer serious injury if not death.
He didn't know how bad the spell would affect him or how much it would hurt, but he knew there was no choice.
He jumped.