You can get out of the loser's bracket by winning the losers bracket. Once done, you will fight the loser of the final round 4 battle, to determine second place.
Well, Dev made some pretty battle deciding errors. In one of his posts he messes up the timings of your attacks, which pretty much invalidates his entire defensive move. In that same post he catches bullets with his hand. I don't know what that's all about. I couldn't really find any errors you made.