The first option - to do nothing - would result in the character being stranded in what was until then an enemy realm without any of the background and context (or even characterization) which precedes such treason.
We never confirmed that he was actually in our realm -- in fact, from what I've gathered it seems he never was. I don't see anything about it on his family history, he wasn't on the character list, and he didn't receive any realm wide messages. Oh, and he was in a battle with our realm's forces at the mountain after the takeover but before the allegiance change.
