For me the most important thing for getting meat when hunting on the ground is the speed and timing of my shot. For myself, the opportunities to take that long get set, aim and hold for for a half a moon phase don't happen very often. Also, it seems that it is easier to get a clean shot off at a walking deer than a standing and staring at you deer. More often than not, I lose the chance for a shot when that old eye ball to eye ball staring contest with a mature deer happens. I copied my wife's technique, bow on the leg, stare at the boots, when it is time to shoot, the head turns as the bow comes up, a half second hold and the arrow is gone. Total time for her is about 2 seconds, for me, a little over one second.