Purely my opinion, but this is something that's been gnawing at me for a while now. When you kill a creature, like let's say a Trepor, you're able to take its wiggly feelers before it disappears. Now, when you die, you and all of your possessions disappear. However, since we're allowed to take animal parts before they disappear, shouldn't it be the same for heads of fallen foes? That head is no longer the possession of the person it came from, since...well, it isn't attached to the body anymore, and you should be able to take that as a trophy while that person you just killed faces true death. A body can't function without a head, so...need I say more?