After killing the Second Officer, Simon quickly controlled the wind to prevent the detection staff from striking the ground, then he carried the corpse and brought it behind a set of stacked containers.
Killing the Second Hazard Officer could have repercussions in the near future, but Simon chose to kill him rather than leaving him unconscious.
If he was unconscious and not dead, he might might awaken too early or be discovered while Simon remained inside Black Horn.
A dead demon stored inside a spatial ring would create none of those problems.
'Fortunately for me, he was just a Supreme Archfiend.'
Simon removed the demon's mask and studied his face before the Sword Daemon's mask changed to that of the Second Officer. He then wore the demon's mask before inspecting the dark clasp.
Fortunately for him, the clasp had no formation or array that would disrupt his plan.
