Advance towards the forklift with Lian, and operate the switch to raise it. Climb up and Lian will follow. Give her a boost and a cutscene will play. You must now provide Lian with cover. Switch to the MB-150 and use the darts to quickly nuke the enemies. Make sure you target and destroy the searchlight as well. A few snipers will spawn while enemies on the ground arrive too. Drop whoever threatens Lian and another cutscene will play.