Nightshade really does move like a shadow, and within a few paces, he is out of sight.
Using her wrist computer, Nim directs Buzz to follow, but she has a hard time keeping track of Nigthshade, and in short order, she's lost him. Sticking with the plan, Nim sends Buzz on towards Alpha containment.
The throne room is a large cavernous open space, but at 12 locations around the perimeter there are exits from the room. Buzz detects patrols moving around, and guard posts, but nothing in the immediate vicinity. Buzz easily dodges the few patrols. Alarms continue to sound. Several times, Buzz has to lay low as a platoon of royal guards comes running past. It seems Galen is still very much active on the station, and it causing trouble for the Imperials.
Eventually, Buzz reaches the entrance to Alpha containment. There is a simply access panel there - it should be easy to slice it. However, there are two royal guards stationed beside the doors.
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