I feel like there needs to be an update to Iron Banner that for every player that leaves midgame because of a blowout or any other reason that they should not only lose reputation but also get decreased reputation in an event of a win. Leaving in the middle of a match ensures a loss and it isn't fair for the people such as myself or other players who stay in a match an collect Iron Medallions making ranking up that much more difficult.
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They lose their chance at the end of game roll. Let them leave.