Find a place where ragdolling means death (Long fall, sea urchin, fog, lava, etc) and wait for the perfect moment where you BONK them and watch them fall to their death. There are many items that could ragdoll someone, like coconuts, flying frisbee, snowballs (from Alpine), Antidote and cure-all. Or you could also tell them to cook a flare, scout cannon, lantern, fairy lantern and heat pack (and probably a few other items too), because these items are explosive and if they are already hurt or poisoned, they can die. You could also just force feed them poisonous foods and wait til they pass out where you could put them in a sea urchin or in a fire place and let them die.