@Kenshin - screenshot of the instance results is very relevant especially in this case.
@UltimateGameman - We know where to report, but our experience tell us something else: nothing will happen to them, so no point to do it. Check my link and see some rigged arenas and the players didnt get any punishment. All we get is an official response like "PL Magmar Guards have been notified in details.". Doesnt help me too much to be honest.
My oppinion is the "reporting" thing it get lost on the road, somewhere between our guards and other guards the chain gets broken. I dont know if its because of lack of comunication or incompetent guards. Or maybe because is hard for a non-valor guard to recognize a valor leech situation or an aranged instance.
As ive seen to this guy, he has tactic: he get in, fight once, do some dmg and when he dies, he wait for the instance to finish. That happened in every instance i was with him, when i see him, i feel like im blowing