Marcelo and Spencer help Hunter understand the mindset behind getting your opponent to turtle, taking their back, and then maintaining control: If your opponent exposes their back, particularly if they do so as a late-reaction or defensive counter to the execution of your guard pass against them, they may be prepared to expend valuable energy to compensate for their mistake by exerting effort towards hiding their back. If when you arrive onto the Back-Position/Turtle, you are focused on keeping your base and concentrating on pinning and controlling your opponent's hips with your weight, you may be inadvertently giving your opponent a chance to successfully escape from your continued dominance over their back. Instead, invest effort towards pressurizing the contact area between the surface of your chest and your opponent's upper back with Seat-Belt Control (a.k.a. Over/Under Control, The Harness, Rear Chest-Lock, Ura-Munegatame, Cross-Body-Ride; farside Under-Hook (left-arm) & nearside Cross-Face (right-arm) with Ball-n-Socket Grip (left over right, palm down), et al.). If you can maintain chest-to-back pressure on your opponent before having fastened the Seat-Belt, by keeping your knees off the mat and driving forward/downward with your toes, you will put yourself in prime position to counter your opponent's Rolling/Roll-Away Escape from Turtle. Staying connected to your opponent allows you to shoot over and dive under your opponent while maintaining dominant control over their back with an upper body control (e.g. ideally, Rear Naked Choke and its variations, Rear-Crucifix, Kimura-Trap, etc.). If your opponent happens to hide their back from your chest while escaping from your passing back-take combination attack, you cannot dive over your opponent without some form of rear/back control, e.g. Seat-Belt Control. Marcelo analogizes with the idea of literally and figuratively cornering your opponent in a game of chase or tag when you are "It." If you purposely give a single opening for them to escape, you can prepare yourself to leap towards that taken direction and catch your opponent, in this case with Back Control.