All five elves in the castle security room are found dead before Samantha enters, proving an unknown infiltrator is already manipulating the ballroom controls.
Samantha reaches the concealed opening above the third-floor security room expecting to disable five guards with a sleep-potion ball. She has abandoned the ball and initially appears to have doomed the mission.
Instead, she discovers every guard already dead. The killings precede Queen Imogen's arrival and leave the control room exposed to both Samantha and whoever entered first, creating a second hidden operation inside the castle.
Five elf guards dead at their stations inside an arcane control chamber.
The unexplained deaths reveal that another faction has reached the same critical controls.