The new sneak peek make me think that they won't fight.

In any case, it seems the fight between Spear and Fang won't happen. It looks like before that can occur, the angry mob will attack Spear, and Fang will most likely just watch and, at worst, help. Resulting un him beign exiled basically.

Also, Spear's reflection! I'm increasingly convinced that this will be the moment he recovers his memories, and the expression on his face proves it won't be pretty.