Mark Worland -- six-foot-something, dressed in tight black and skinhead bald -- grabs Navid by the arm.
"Come with me!" he barks.
"No!" screams Navid, barely 5-feet tall.
Navid throws himself on his back, locks the bottom of his feet to Worland's knees, and shields his face and head from Worland's flailing fists.
"Great job," says Worland, a self-defense specialist, shaking Navid's hand and helping him up, as Navid's friends applaud.
This self-defense class is part of a repertoire of life skills that Navid and his peers are learning at Independent Living Skills, a summer program for developmentally disabled adults run by Etta Israel Center, a mid-Wilshire nonprofit for people with special needs.