Ok, I am on mission 9A, the one where you escort the Avenger through the Venice jump point. The thing is, when the Avenger comes back, I find myself fighting infinite waves of fighters! I managed to shoot down the Ray at Nav 1 before it could signal the Nephilim fleet, but what do I need to do at Nav 3? Do I need to kill all the enemy fighters BEFORE the Avenger comes back through the jump point, or just the Devil Rays, or what?