Our two teammates left one round before the switch, (8-4), and remained afk throughout the rest of the match. The final score was 12-14, and 2 of us went down 1 bar, while the third went down 2 bars. Can someone please explain how a 3v5 that went ON UNTIL 12-14 DOES NOT WARRANT a relaxed elo game judgment?

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This is a screenshot of the scoreboard, in which it can be clearly seen that the 3 of us were the top in terms of Average Combat Score, and yet we still go down in ELO.