Rex was under the impression that Princess Davina was someone who held the sword of justice.
She was someone beloved by the people, and acted accordingly.
From what he knew, the Arcalen House wasn't an important house nor its bubble.
Even if it was within her territory of authority, there was no need for her to take up the task herself, as her rank was far beyond the mundane task. Most nobles would probably dismiss the bubble's destruction as the work of the Voidal Monsters.
And nobles who were remotely caring and good would only send someone to investigate the cause.
The Spirit Realm was like a man caught in the coils of a man-eating serpent, which was the Black Rift.
A bubble's death was nothing unusual in this world; its death was no cause for shock.
It was merely another grim tally in an endless list.