Can somebody please explain how on earth these guys are hovering nose down??? Like Scott Foster at ETOC this year where he kind of torque rolls stationary nose down..

All the rest of the stuff he does is understandable but hovering and keeping it in the hover..
Theres no prop-wash over the tail surfaces.. or is there a little from the prop sucking the air down?? I dont get it.. I dont see how his rudder an elevator has any effect..