The Remount Technique
You start to lose the back mount when BG slips away, so switch your feet to remount.
When you mount, use your grapevines with hip pressure and hands to maintain that position. If they roll to their knees, you have to quickly release your grapevines and get the modified mount position to take the back. If you do not you will get rolled off.
RNC: This is the most powerful weapon in all of the martial arts. It can take anywhere from 5-15 seconds to put a BG to sleep.
If you choke them for longer than 30 seconds the result can be fatal.