This is what is most baffling to me as well. As violently as PF murdered KB, it’s obvious he has no qualms with committing murder. What made him so determined that KK was the one who must do the deed? Also bizarre is her making that long drive 3 times, only to chicken out. That’s a lot of time in the car to think through what you’re going to do. The “YOU HAVE A MESS TO CLEAN UP” also reveals something, I’m just unsure what that is. Finally, what was in KK’s mind that she felt responsible for the clean up? Horrendous job, why did she do it?