Free: Contests & Raffles.
This scenario is fundamentally no different than dispatching a gravely wounded animal on the side of the road that's been hit by a vehicle.The ethical thing to do is to quickly and humanely put it out of it's misery. The only difference between you doing it then or wait for an "authority" with a badge is that the animal suffers longer. The end result is the same.Let the other camp tag it if they want.
Id say put it out of its misery. Sometimes the right thing to do may not be the legal thing.