The sudden Teleport surprised quite a few of the viewers. But to a pro player, Teleport was pretty much considered a required skill for Mages. Thinking about it more closely though, since Ever-Stay had Teleport, he could have easily combined it with the burst of speed that Dragon Breaks the Ranks provided and chased Fang Rui down. It didn't seem at all necessary to save it and use it at the last second. So did that mean he didn't use it just as a setup, a setup where Fang Rui mistook his skill build to not have Teleport, and thus lure him to let his guard down against it?
A normal player would not have given a second thought after observing this move. But to a pro player, there was often a deeper layer to things.
A competition of endurance?
From the start, this was only in the eyes of the average viewer. None of the pro players considered it to be that simple. It would be looking down on them if you expected a pro player to make a basic blunder like this.