This video takes place after about an hour of as intense as what is seen here. The boy has a shock collar on his nuts and was being shocked any time he lost control and grunted or yelled too loudly. What you can't tell from the angle is I still have it in hand and am periodically shocking him in response to certain behaviors. My room at the time was a little cramped so some of my positioning is odd, but I was a little too focused on making him suffer to care. At one point you can see his hand convulsing wildly, and if you understand the process he's been through this is the physical equivalent of a full-throated scream.