DETROIT—Area bus passenger Robert Herndon, clutching his head and rocking back and forth in agonized pain, was utterly ignored by fellow bus passengers Tuesday. The 17 other passengers on the bus employed a variety of tactics in ignoring Herndon, including looking out the window, gazing intently at the bus' advertising placards and staring at their own feet. "This is the C bus, right?" passenger Darryl Frost asked another rider in an effort to appear unaware of the moaning, doubled-over man sitting four seats away from him. "It is? Great."