It wasn't as though they were all serial killers. This is just our occupation. [So, not all of them would even be killers.]

As I mentioned, he only returns Friday the 13th so there's something particular about the date and he targets camp counselors. Since it's only been this camp, something likely occurred at this location. [She would be able to narrow it down if those documents didn't happen to be missing...] ... Well, if this helps, he favors a bladed weapon.