Halo 4 Campaign Mission 6 - Shutdown

After Del Rio rejects helping Master Chief and Cortana, they head to the hangar to grab a Pelican (Lasky kindly kitted them out with a minigun and laser). They travel over to the Didact to stop him from leaving Requiem. If he gets his hands on the Composer, it will be over for humanity. Cortana plans to bring down the Cryptum's shields down at two traffic control towers. After he realises what they were doing, Cortana decides to trap him with the floating defence spires, but it isn't so easy.