Once you gain control of Hayden, walk into the radio building. Watch the cutscene and now you've acquired the Glaive! Time for some fun. Walk forward through the door and take cover behind some barrels. Lasrian troopers will come to attack you. Pop out of cover when you have a good shot and throw the glaive; you don't have any ammo for your pistol. Again, try to aim for the head to kill enemies faster.