Hey, good question. I know the synopsis was kind of vague, so let me explain.
The Boss (leader of his mine) was really trying to help him and the village. Marc should have been killed for "using sorcery," but the Boss had a kind heart, and knew Marc would never have done it if he'd known about it before. The Boss let him live, but had to banish him because he didn't want the government to hear about it (in which case, they'd probably fire or kill him too).
Hopefully that should help. It'll be a lot clearer once I finish Chapter 1. There's a bit more to it than what I explained (note the quotes around using sorcery), but it should be much easier to understand in the game.
Thanks for the feedback, anyway