There are two kinds of chokes. Blood and air. The air choke is when someone is choked unconscious by cutting off his air supply. The air to the lungs is suspended. In fiction the person chokes and flails in silence, and after maybe thirty seconds he is rendered unconscious. In reality, cutting off someone's air supply would take several minutes and he'd be at full strength the whole time. Do not choke someone this way (Fridge Logic: If you're reasonably athletic and don't smoke, you can probably hold your breath for over a minute voluntarily. Try it; there's no risk. Why should a choke hold be any different?)