@icarushector That's true, sure, but people are saying he's a pussy or a coward for not just stabbing the guy on the spot, or saying it's out of character for him not to, and that's wrong. That is not true. It is very much in his character to just threaten the guy and walk away. He's not in this for revenge, he just wants to go home. That's all. That's why he's not helping the Hero Party, because he knows the secret of the world, or at least part of it, and has figured out that the fastest way home is to defy the gods, not serve them. If Mr. Fireball tried to stab him in a dungeon or something, I'm sure he would just blow the guy's head off and keep walking, but that's not what happened here.
The MC already decided he won't waste time seeking revenge out, because that's time lost on trying to escape. I'm sure he would take the revenge if it fell into his lap (and it looks like it will eventually, go figure), but he's not going to seek it out. That was already established a long time ago. That's what I'm saying. I think some people here have forgotten what the MC's motivation originally even was. He wants out, of this world, of the system, of the game that's being played.