Blind Jiu-Jitsu competitor proves he’s anything but a pushoverIT IS mid-morning at Lange’s MMA gym in North Manly. An advanced-level Brazilian jiu-jitsu class is well under way and it quickly becomes clear that this is no place for the faint-hearted. Divided into pairs, the gym’s members are rolling, wriggling and stretching their limbs any way they can in the hope of forcing their opponent into submission.