Alright then, you are the third judge. There is no problem whatsoever participating and being the judge, you just can't be biased totally. If you feel someone should win, but better arguements were given, you are obligated to go against yourself. Be fair is all.

Well, I don't know all the characters, and honestly, that makes it better to be a judge in that instance. Now, instead of having a pre-conceived notion of the who I think should win, I am forced to read everything and make a judgement based on the way we want a judgement to be made.