"Then he will be alive." Miserable, overjoyed, furious-- doesn't matter, doesn't matter how Goodnight feels about survival, so long as he survived. Maybe he'll ride on and find another like Billy, maybe he'll stay with Sam Chisholm and remain at his side this time, maybe he'll stay at Rose Creek and live as a hero instead of an angel of death. Billy doesn't know what Goodnight will do, but as long as Goodnight continues into the next day, that's all Billy cares about. A man like Goodnight deserves a better death than the one he got.

So Billy looks at Vasquez again, his brown eyes betraying no remorse or give in the stance he's taken, just firm determination. "Simple."