If I honestly have to think of something, there is two ways I can see voting. First, we decide based on who's likely to agitate the rest of us against eachother. The red-haired young man, for example, or either of the people who provoked the dragon enough to attack him.

The other option would be, and I'm sorry to even say, but would be to try to discern who would be a more filling meal, to possibly minimize casualties.