Ryze's Ultimate Cannot Teleport Ryze to a Targeted Place If Ryze Recalls Back During the Porcess

Generally, the idea of Ryze's ultimate is that ryze should be teleported to a targeted place as long as ryze is right in the circle of the portal. However, when Ryze recalls back during the process, the process cannot be cancelled. And Ryze is able to stay at the original position. This seems to be against the idea of Ryze's ultimate.