text:  He says he decided to join in. According to prosecutors, Inga told NYPD investigators that he tied both the boy and girl together with shoelaces, holding them at knife point, put a gag in their mouths, then took the knife and cut the girl's shorts and underwear off to begin raping her, all while filming the violent sexual attack on his cell phone. Once he finished his attack, Inga told the two teens to not move for 20 minutes.