Make your way over to the car and get on. Then, when nothing happens, get off and head towards the razor wire. On the other side of that will be more lambent and if you follow the platform around you'll come to a dead man and a collectable. Go inside and watch for more lambent, particularly from under the half open doors. Follow the path around to the back and cut the safety cable.
Once done with that, follow a similar path around back outside and you'll be back just after you got off the lift where you started this chapter. Get on the gondola and start heading back to Tower 1. And now it's back to the locust! While on the gondola, you'll be attacked by a couple of barges, just clear them off to stay alive, no need to actually take them down. Once you get into the tower, you'll be attacked by a few Theron with Retros and some more of the shriekers we saw earlier. Continue climbing the stairs taking down shriekers as you go. You'll get to another room with some theron guards and once you clear them, you can drop down on the right side. Drop down and climb the ladders you find.
At the top, follow the patio around the side of the building. Kill the shriekers as you pass by. Enter the building and you'll come across some theron guards which, with any luck, may not even be facing you. Clear them and you should find yourself in Griffin's office. If you look under one of the couches in Griffin's office, you'll find a magazine. Break the couch to get this collectable. Go out into the hall from the office and up the little ramp on the left. You'll move down a corridor with cover and fight more therons and shriekers. This will let you out back onto the roof. Follow the patio again and you'll find Dizzy and Griffin.
*cutscene*
