Zhang San approached the windows and discovered they were all made of colored glaze. He could see everything outside but was unable to break through them.
Therefore, the method of leaving through the windows was clearly not going to work.
Looking around the rest of the room, Zhang San found that there were only two other possible exits.
One was the room's main door, which would necessarily have to be opened whenever someone came to deliver something to him, and at that time, he would figure out a way to slip out.
The other was a skylight on the ceiling.
Standing beneath the skylight, Zhang San felt the cool air slowly descending from it and immediately performed Ninefold Scrutiny.
Sure enough, Zhang San saw an operating Formation around the skylight.
Under the effect of the Formation, the air outside the skylight couldn't freely enter, only allowing a part of the air to come in, which is why there was a gentle flow of cool air coming down from the skylight.
