Keeping your head straight up wouldn't do it. Leaning your head 45 degrees to coincide with the angle of the cant wouldn't do it. Your peep/pinline-of-sightare on a completely different line than the launch angle of the arrow and the two lines do not intersect. The arrow will hit far to theleft when the bow is canted 45 degrees to the right and you have the sight pin on the target. What you claim you did is physically impossible.
Arthur.....All I can tell you is....go try it. I was VERY skeptical....and I went down to shoot it at 20yds. I can do it again and take photos.....but the two groups of 3 arrows were about the same size.....just the canted right arrows were lower.....maybe just a couple inches.