You dragged your tier 6 buddy into a tier 9 battle. Of course they are going to accuse you of trolling. Had it been say tier 7 as top tier nobody would've cared.
Also, your friend did zero damage which is beyond unacceptable.
I typically brawl on the south road regardless of where I spawn or what side of map I start on. I tend to do well in that area and hold up the enemy advance or shoot them to pieces.