It's really annoying when you are beating someone and they go to a group to 7v1 you. I suggest a system where when someone hits you, both of you will be locked together and no one can hit besides you, like the /kill command, that you need to wait seconds to do it. After 30 seconds when you stop hitting each other, you are free and can hit another person and you guys battle. Maybe that isn't the best idea because there could be campers that just shoot you and locks you but something that stops 2v1 or 3v1 will really help.