Neighbors shared information and worked together to try to stop a stranger who they say followed a 12-year-old girl to a Southeast Portland porch, exposed himself and asked if she wanted to have sex as he cornered her. . . . Portland police arrived and arrested a 20-year-old man, Bill Glenn Fomonyuy, at 8:39 a.m. Monday on allegations of coercion, luring a minor and public indecency. Fomonyuy was booked into the Multnomah County Detention Center at 3:47 p.m. and released on his own recognizance four hours and 15 minutes later.