It takes fierce determination to hold still, and my buoyancy does not change from inhalation with a rebreather, so on one hand inhaling doesn't change my buoyancy, on the other hand, I can't use my lungs to micro-adjust buoyancy so I typically need to drop to my knees to stabilize and often time there is nothing dead enough for me to feel comfortable kneeling on, so at times I cannot get the shot.