When your opponent recognizes that your seated guard is dangerous, he will likely attempt to force you out of your comfort zone by rocking you on to your back. If he stiff-arms your head to push you backward, your posture should be strong enough for you to maintain the seated guard without having to adjust your base or to attack his arm. If your opponent controls your legs, however, you should remove the grip immediately. Waiting to address a grip on your ankle, for example, gives your opponent the opportunity to lift your legs into the air or to pin your legs to the mat as he circles around your guard. Neither outcomes are acceptable, so you should break and counter the grip right away.