Something bad happened. A pony was slain, by a fool. He never once questioned his loyalty aloud, only in his troubled mind. The aftermath of that death caused him to escape the righteous fury of the royal guards, taking refuge near a lake on the edge of Equestrian territory.

There he sits and ponders his actions and wonders what should become of him. Whilst attempting to come to terms with what had happened, he is found and confronted by Princess Celestia.

He expected a reckoning for his disloyalty, but he got something else entirely. Maybe this is the right choice.