Maybe Butch has a hidden sense of honor or morality that makes him act against his initial intentions.
Perhaps Butch has a moment of empathy or realizes that they are both pawns in a larger, messed-up world and decides to do the right thing.
Marcellus wanted to kill Butch because Butch double-crossed him and refused to follow his orders in a fight.
Maybe it was just a random style choice for his character. Could be to add a bit of mystery or quirkiness.
Maybe he got injured in some previous incident we weren't shown.
Well, Butch's presence in Pulp Fiction is crucial for several reasons. He creates tension, brings in elements of redemption and fate, and his interactions with other characters shape the overall narrative.
It might be a symbolic detail related to his character or a part of the story's mystery.
It might be a random detail added for style or to add an element of mystery. Sometimes, these little things don't have a deep meaning but just contribute to the overall look and feel of the character.
Vince might hate Butch because of their competing interests or different personalities. Maybe Butch did something to cross Vince, and it led to that hatred. It could also be that Vince is just a jealous or intolerant guy.
Butch kills Vincent because of a series of escalating conflicts and misunderstandings that lead to a life-or-death situation.
Maybe he was in a fit of rage or had some urgent reason. But it's hard to say for sure without more context.
Maybe Butch's character adds an extra layer of complexity and unexpectedness to the story.