Laura's identity had changed; she was no longer a candidate for selection in the Phantom Brigade, but now part of King's Defense.
The procedures were handled by Magus with a simple reason: Laura's physical condition didn't allow her to serve in the military.
Normally, Gao Guang should have left after completing her tasks, but the current situation didn't permit it, one reason being that the Rookie trio hadn't finished their recruit phase yet, and another was that King's Defense had daily opponents available for exercises, allowing them to treat the Phantom Brigade as imaginary enemies—a rare privilege indeed.
Moreover, Magus wasn't willing to let Gao Guang and the others leave, and though he seemed increasingly anxious, no one knew what he was waiting for.
Gao Guang didn't bother with those concerns; her current life was quite comfortable.
It was like being on vacation every day, and she could still practice marksmanship—so why rush to leave?