1. When I see another player fixing the car/boat/fuse box, protect him from Jason.
2. No deceptive playing (I'm talking to you, whoever closed the door on me and locked it when Jason came after us). Of course, not every kind of trickery is deceptively bad. It's happened to me more than once where playing as Jason, a player tried to lead me away by pretending to say something to another player like, "We'll meet up at the car" or "take the battery". My fault for falling for that. One time I was chasing a player and another player was hiding in the bushes. I pretended not to see him until the last moment.
3. You cheat and I will try to take revenge! So on the Higgins Haven map a player went on the lake rock, preventing me from drowning him. A little later I came across another player with a shotgun. I made a deal to spare him for now if he'd shoot the cheater. Well the guy found out and took off. When I called him out for cheating at the end of the match, he tried to justify it as a strategy, then claimed we were the ones cheating by teaming up a counselor with Jason, then threatened to report us. More annoying was how he made it sound as though we'd get permanently banned right away because apparently HE was in the right while WE were the ones playing unethically.