Is this an Ekko Bug or intended?

Potentional Ekko Bug?
Uploaded by Mötzel on 2015-05-16.
So as you can see in the video I can follow with the blink of my E a flashing enemy over a wall where I have no vision. I think this very short cast time as shown in the slowmo is making this possible but due to the fact that the tooltip says its a blink I dont know if I should be able to do this. What do you think?

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