"Opening a ton-heavy door with a single hand, isn't that a bit over the top?"
While practicing the Art of Controlling Objects on the platform outside the cave mansion, Dong Tianyu was already aware of a wisp of Spirit Energy in the air around him.
For comparison, if the Spirit Power contained in the air of the same volume inside the cave mansion is 10, then the Spirit Power in the air outside it is only 0.001
Though the quantity of this Spirit Energy is vastly different as compared to the one contained within the cave mansion, the existence and absence of it are two different concepts.
However, even though the air possessed Spirit Energy, considering its thin allocation, it could only be considered the initial stage of the revival of Spirit Energy.