You asked for honesty, so here goes. Why are you road hunting? I hope that is just a scenerio that was written to try and lead up to a question of what to do with a bird that may be suffering. With that being said, I'd just take out the trusty old pocket knife and finish the job. I would be sure to take the head all the way off to severe the spine so that there would be less suffering.

Personally, I doen't think road hunters[:'(] have enough ethics to be bothered by an animal's suffering anyway.