Dragon hard reset as I was doing it

I am playing Shaco, and like normal, I'm using my boxes to tank dragon for me. I begin dragon at 6:46. At 7:29 it begins to hard reset and regain HP seemingly without purpose. I was standing still and dragon was not moving, but aggro switching between myself and boxes was happening. I have attached logs of the game. Here is a GIF I created of what happened to me: http://im.ezgif.com/tmp/ezgif-2002723465.gif

The only file that supports video and is supported by this forum I think is .R3D but I do not know how to record this in .R3D so that's why I made a GIF instead. My IGN is VD Oblivion.