An allegedly racially motivated attack on a black man lands two Bend residents and one person from Canby behind bars for felony assault and intimidation.  After exchanging insults with a couple on S.E. Third Street, police say 23-year-old Roger Post of Bend and two teenagers got out of their car and attacked 19-year-old Darryl Lindsey.  The suspects fled before officers arrived, but witnesses got a license number, and all three were arrested at the home of the registered owner.  Post is now held in the Deschutes County Jail.  The two teens wound up in juvenile hall.