It was night period, the cold wind did not blow this day with a full moon. Which was a rare sight, in this period of time in this world.
Chen and Mai were looking at it while waiting for Rui to come. Given, that all of them were headed to the spiritual world this time.
While they would use the whole night time period to spend in that world. That would be around, a 20 to 22 days period in that world.
So, Rui was insisting on taking the time to make the other people alert them. Through this, they will not have to worry about three of them.
At that point, Chen learned something new about the spiritual world, given it was a golden world for magicians like them.
Where the two of the girls were so angry about him, when not using the time inside the spiritual world to train at all.