I just went back and watched this guy OD again. And something I noticed was that Derek was restraining GF by placing his knee on the rear/side of his neck. That area is ALL muscle. If your esophagus is let's say 12 o'clock, his knee was on like 4 to 5 o'clock. Go ahead and press your hand on your own neck right now at 4 o'clock. Notice any constriction of your ability to breathe? At all? Me neither.