This part of the story happened very fast for me. Meaning it went from a nice day to instant life changing moments. Each time that i thought they were done with the situation it escalated. When Mersault can't handle facing the girls again after they return to the house the second time, he goes to find peace. It was very ironic how peace was where a potential danger just was but still it was better in his head then going to face his "friends" Mersault seems to not be able to handle emotional situations. he seems to have an emotional detachment and disconnect.   "at the motionless body where the bullets lodged without leaving a trace." The fact that when he shoots, he shoots 4 more times as if he was a sociopath in a way.