the enemy team just pushes the base until they win. To be honest you shouldn't leave the match even if your other 4 team mates do first, because it still counts against you (leave a game automaticly marks you as a leaver, then your team can mark you for leaving aswell)... Just let the enemy team win or do random stuff for the heck of it like dive their towers in attempts to take em down etc, not to mention if you are the ONLY person left on your team at the end, chances are you will be receiving multiple honorable opponent marks at the end of the match