Instead of Han finding Kylo, Hux finds Han first. (Maybe Hux knows it's Kylo's dad, maybe he doesn't). Hux is more than happy to rid himself of a washed up old smuggler currently in the midst of blowing up his prized super-weapon, and Kylo watches as Hux kills his father.

How does this change things? Does being a witness instead of the perpetrator make Kylo see things more clearly and return to the Light? Or does he just go numb and fall further to the Dark? Or does he just snap and take immediate revenge against Hux for interfering with his mission to kill Han himself?

++ for involving angsty and/or hurt/comfort Kylo/Hux somehow (but this would be fine as gen, too)