A while ago;
When the Sun Academy student named Archie alias Ark reached the monster zone of Aurora, he already sensed that a battle was going on.
He didn't participate in it and decided to wait until they finished the boss and leave. However, he didn't expect everyone to be defeated despite collective efforts.
As the beast was chasing down the remaining three, Archie unleashed his soul skill that let him create an invisible spatial barrier even within a pocket world. As a result, Laura disappeared from Aurora's sight and senses.
And then, seeing that a guardian was going against it, he thought it broke the rules or something. He decided to act when it was vulnerable.
While that situation never came due to the fact that Aurora easily overpowered David, it still gave Archie a window of opportunity and he took it without any hesitation.