I Think A New Rule Should Be Added To PvP Which Is: No PvPing Other Players When Not Agreed To Fight With Both Players. I Hate People Who Interfere With PvP Fights, So Please Add This Rule.
I agree that it should be enforced better, but it also should just be common sense. It does happen sometimes but staff always takes care of it. Also a lot of people just go to pvp to mess around, I've seen people do it and I, myself have done it multiple times. If their interfering just ask them not to, problem solved, and if they are still doing it ask for a staff member to help, they are here to help after all.
It is pvp. If there is no agreed fight going on, it's fair game for someone to attack if they are in the pvp zone. It may cause situations yes, but it isn't illegal, if there is an agreed fight, then yes, don't interfere Sorry if this made no sense xD