What's so different with Mark's consciousness, is that he had an entire dark castle as a memory lane. Even the environment was different, as it contained actual texture and physics. Alissa felt as if she was not inside someone's mind, but at a different location instead. The illusion that builds up Mark's consciousness was basically that powerful…
In fact, there isn't even supposed to be any illusion. Based on every mind that Alissa had interacted with before, the place that she finds herself after entering someone's mind, is supposed to be an endless white space with balls of core memories floating on top of the surface.
But Mark was different… Instead of the endless white space, it is an empty and rocky terrain that expends beyond the horizon.
As for the balls of memories… Perhaps they are inside of the dark castle…
The sky rumbled. Lightning could be seen passing by… It was not a beautiful day within Mark's mind, and bad memories might be the reason for that.
