Placement matches

What the actual f? I had 6 wins and 4 losses in placement matches, i carried 5 of the wins and they had a disconnected one in the last win. My friend won 4 and lost 6. Now get this, he gets placed in silver II and i get placed in silver III. Now how does that work out? Even more annoyingly the last match lasted an hour and we lost the match because of this Fiora from woodchipper league V constantly went top lane and never participated in anything besides killing minions, ending with 1/16/2 in stats.
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