Tony Hawk wants to be able to walk “unaided” after seriously injuring his leg. The 53-year-old skateboarding legend snapped his femur – which has impeded his ability to walk without help – but has a new goal of being independent on two legs again after attempting a McTwist, which is a front flip with a 540 degree rotation. Speaking to TMZ Sports, Tony admitted his problem was that he had “very little speed and an unsteady grab” and smacked down onto the halfpipe. He added: “I hit the wall sooner than expected in a half-squat position and it sent me straight to the flat onto my knees. “The forc…