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I'm in 2 minds about not being able to leave in champion select. No doubt it is annoying BUT you're now going to be forced to spend 30 minutes playing a game that you lost during champion select. I had a hero set-up last night that was destined to fail and sure enough it did even though we dominated the laning phase. It also means you can't leave if one of your team is AFK and doesn't even pick a hero.