First blood isn't the only thing we use to determine whether a game counted or not. Unfortunately the process isn't 100% precise - we just don't have enough information to know for sure either way.
I had a game where first blood happened, but it still did not count
http://dotabuff.com/matches/220328677
this actually sucks. got these douchebags on my team the next game same thing happened but we lost obv. game counted
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then the guys who died abandoned does the game still count to dotabuff? game ended at 0:40, it counted on my dota page as first blood happened.