"Au contraire. It's only justifiable to myself. I knew it wouldn't be for everyone else."

He folded up his handkerchief and put it back in his pocket as his shadow decided to leap up from the ground and occupy 3D space just behind Rocky to leer over the stranger's shoulder.

"And all that separates them is the time between kills. A serial killer has at least two kills under their belt. A mass murderer is someone who kills at least three people in a single incident. Therefore, all mass murderers are serial killers but not all serial killers are mass murderers."