Death by blood loss, which by its very nature tends to be quite a drawn out way of expiring.

This category is intended for killings where the blood is drained from the body, for example if a vampire or other bloodsucking device plunders an artery.

It will also apply where a character has been bloodied up but takes a significantly long time to die. So, if someone gets shot, it won't apply - but if they get shot and then wander for hours in the wilderness, bleeding all over the forest floor, then it probably will.