Zor and Bandis were doing exactly as they were told.
Bandis took Rex away because he had to cultivate right now and that too in an open space where there would be an ample amount of mana rather than the confined walls of the castle.
He could basically teleport himself and could cultivate, but it seemed like he was minimizing the use of mana right now and was only focusing on his recovery.
The moment the doors were opened, Alex and Elina rushed from the place where they were standing.
It seemed as if they could hardly contain their worries.
"Rex!", both of them shouted in unison and entered the room only to find the bed empty.
It seemed as if Rex was missing and that came as a shock to them.
They looked here and there and found the old man to be missing too!
Elina and Alex were also shocked when they saw Zor standing there.
They immediately asked, "Where has Rex gone? Have you seen him?"