Prone Standing Armlock
This is a transitional position that is often assumed after an arrestee has been rolled over onto his stomach.
Unlike the supine standing armlock, this technique can be held in this prone position with the officer maintaining a standing posture while adopting a straight-arm bent wristlock (point his fingers towards his head) since the arrestee’s body weapons are face down.
Your butt-side hand (or both hands) could apply the bent wristlock, allowing your other hand to grip his forearm, press on his triceps with your knuckles, and help press his shoulder into the ground.
This pinning action on the shoulder will stabilize the wristlock while preventing the arrestee from rolling out of the technique.
An elbow-lock can also be applied by moving his straightened arm towards his head, using your head-side leg as a fulcrum.
After scanning his environment, you can then adopt the prone handcuffing position by kneeling on the arrestee’s back with both of your knees angled down his spine as to stay off his neck.