Have someone who can Mind Control camp at the GraveYard nearest to the red portal. Use mind control and force them to jump through port out of the BG and flag them with the deserter flag. You do this enough, the opposite side will not have any players that will be not flagged to come back into AV thus allowing your side to win. Of course if they report you to GMs, you might get in trouble. Have fun with this while it lasts!