Has this sub gotten himself into quite a bind, or quite a bend? Well, either way it spells the same thing...H-E-'S--F-U-C-K-E-D!
This one is pretty simple, really, and the gravity of this predicament (no pun intended) doesn't fully sink in until you're in this one. Just setup the stocks with the planks to lock hands just over the planks to lock head. Then help the sub lean backwards, putting his neck in the large slot. Then lower the upper head plank, lower the bottom wrist plank, and help him get his wrists in the wrist slots (at the widest point, of course). Then lock everything in!
At that point, gravity, among other things, starts working against him. He sort of has to hold himself in position like that...until the diabolical mind that locked him in this predicament decides to show some mercy and release the latches that are the key to his freedom. It's so easy to do, really...just a quick grasp of the latch, followed by a quick turn of my wrist. It's even easier NOT to do. <evil grin!>
So at this point, my immediate choices are to use the very quick, easy, minimal effort on my part to release him. Or maybe to get down next to his head and whisper into his ear...telling him how fucked he is. How I'm in complete control of him now. How I could leave him like this for HOURS...and there's absolutely nothing he could do about it. Or how I could add sooo much more to make his predicament that much tougher to deal with, since his entire body is open season, vulnerable to my sadistic whims!
And speaking of gravity...it kinda looked like he was letting himself slouch a bit. Hmm, now what could we do about that?