After escaping the binds, make your way through the other covenant in the next area, two ghosts and a few squads of Elites and Grunts start to attack. Battle these forces off. It is useful to take a ghost from one of the elites to make the area easier. More troops will be transported in through phantoms, battle these squads and make your way to the next area. You will need to fight off more forces while waiting to be saved. Depending on difficulty, you can face the same units from the last area, a wraith with those units, or a few hunters with them. Finish destroying these forces and make your way to the pelican. The mission then ends and you will be brought to the stats screen.