If you knew that already - good for you... I could also write that about any other post there is here, doesn't mean it's true though.
About being an exploit - I thing it obviously is an exploit since the mobs are not supposed to wait for you instead of coming to you and attack you, and it's shown pretty clearly in the video that it happens that way (and that they do not evade).
How about a little support instead of this silly attitude?