ouch im sorry Unfortunately the biggest turnaround i have seen was someone come back from down 5-1 in the first leg. But you never know! At the very least you can redeem your big loss in the first leg and not let him go to the finals easily. And you never know what the game will generate. Maybe he gets a red card that makes his formation illegal and you pounce. I would say use the second leg to try some things out. Good luck!