—— Water Prison Training.
The reason Yorkshire turned around to see another version of himself still frozen in that ice wall was because Andrew quietly cast a Water Magic called "Water Prison Training" on him.
In short, it's a kind of magic that temporarily "separates soul and body."
And just like the "Long-range Water Needle/Zero-Distance Water Cannon," this "Water Prison Training" also has two modes—
First, it draws a part of the enemy's Soul Will out of the body, with the spirit body in front and the physical body behind.
Second, it leaves a part of the enemy's Soul Will in place while the physical body is in front. And this is exactly the current situation with Yorkshire.
In fact, Yorkshire has been released from the Ice Prison, but a part of his spirit body—namely, that "Yorkshire" he turned to see—remained in the Ice Prison under Andrew's subtle Magic Effect!
