Mia Kang collapsed into the arms of a stranger after a pervert followed her through the streets of Milan.The creep, who had been pleasuring himself during the pursuit, backed off when the good Samaritan yelled at him in Italian. But the 2006 incident left Kang a wreck.“I just wanted to go home, lock the door, get in bed and stay there,” recalls the 5-foot-9 Sports Illustrated beauty in her memoir “Knockout” (Abrams Books, out Oct.