Graves can auto attack teammates without clicking them
If you pay attention to where my mouse is at about 9 seconds into the video you'll see move hovering a minion about to click it to get some life steal to save me from malz DoT. However, what actually happens is I turn 180 degrees and attack my teammate when there is no minion or ward or Teemo shroom there. This causes me to not get any life steal from my auto attack, lose 1/2 of my auto attacks for that reload clip and die since I didn't get the life steal.
Edit: I'd like to add that this is on the live server