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“If you are called to roll with a jiu-jitsu instructor, rolling means rolling. He may toy with you. He may decline to tap you. But he expects you to do your best to defend yourself and to attack him. When an instructor’s body can no longer do what his mind tells it to, then he does not roll with students in this way, but provides wisdom and leadership appropriate to his rank and age. Students also adjust their intensity level appropriately to the training context. It is not inconceivable that a strong young blue belt could tap Helio Gracie out in 1999. He would pay a high and painful price for the glory of doing it however. There is a reason for age, weight, belt, and gender categories in competitions.”