a big griefing problem i have come across is the constant knocking out of someone which i dont think has been addressed to my knowledge. for a example you could in theory knock someone out..wait for them to wake up and knock them out again.
a easy fix for this would of course be a 1 knock out rule per day. meaning if you are knocked out by another player when you wake up again if you are knocked out by another player you insta die. this stops constant griefing and fix's alot of the issues that could happen if you can pick up someone that is unconscious. as you can no longer knock out, pick up, knock out, then pick up again. its 1 knock out then if you have the endurance pick them up and carry them around for 3 min per real life day and that's IT per person. if you expect to get any farther you get them to move of their own volition which you can do in certain situations.
for a example lets say you knock someone out, bind their hands, pick them up and start moving. 3 minutes later were you probably have taken them someplace where they cant call for help or even know where they are you give them a choice. come with you and they wont die, don't or try and excape and they die. they will have a choice to either try and run and risk being killed as they will not be knocked out and instead insta killed if their hp drops to zero again. or they listen to you and do what you say
this could also be used for justice systems as well. for example if your a bounty hunter and you have the bounty token for someone. after you knock them out and drag them a good distance and put some nice hand cuffs on them you can then present the bounty to them and give them the choice to die and take the spirit loss of not only their death but for all the crimes that the bounty has them listed for or they could walk back with the bounty hunter to stand trial and perhaps be proven innocent or reduce their punishment. ideally this message showing the bounty and the crimes and punishment should be shown to the person the bounty was written for when the bounty hunter knocks them out. letting them know they have been caught.
THIS makes it far more interesting as it gives players the choice to either die attempting to escape or stick with their captors until their ambitions are fulfilled be it bringing in the bounty or ransoming a king that does not want a massive spirit loss due to the fame system. it also means you dont need any weird unique mechanic for the justice system to work and gives players of many different play-styles to use it as a tool be it bounty hunters or kidnappers
the only issues then are that of water and throwing someone in to the ocean.
ideally if you are thrown in to the ocean unconscious then you wake up with full endurance anything binding you is removed and you can basically try and swim to the shore.
IF THEY THEN TRY AND KILL YOU IN THE WATER: i would say that if you are killed while in the water near a shore (1-3 minutes from the shore) then you should re-spawn there. notice i say "KILLED" and not "DROWNED" which is a big difference. drowning is where you fall unconscious from exhaustion and then fall beneath the water and "drown". but if you are killed aka knocked out AGAIN because of another player and not you exhausting yourself. for a example if you are knocked out on land, put on a boat, taken out to sea, then thrown overboard, and then as your trying to swim your way to land they put a arrow in your back which would normally knock you out but because you have already been knocked out you instead instantly die resulting in death by arrow and not drowning. WHAT THIS MEANS. is that you simply respawn somewhere on shore away from the people that killed you after performing a spirit walk. BUT if you cannot make it back to shore before your endurance runs out then you lose conciseness and drown resulting in perma death. opc's could potentially just swim to the closest shore if there is one nearby.
notice in this situation it is "near shore" and not "in the middle of the ocean". in which case if you are killed out there expect to die. pirates are gonna be hated far more than they where in the colonial days xD
although just to be safe i suggest staying away from big bodies of water near creepy people.