after a man assaulted the driver while the bus was traveling at more than 70 miles an hour. cnn s miguel marquez has more. reporter: a nightmare on wheels. 1:45 a.m. just west of phoenix, a passenger on this greyhound bus attacked the driver. get this guy off of me, get this guy off of me. and the guy said, i m going to flip this bus. reporter: police say he was high under the influence of heavy drugs when he began shouting incoherently that the u.s. was under attack and that he wanted to turn this f-ing bus over. i woke up to this commotion. and i remember screaming. i realized we were not on the road anymore. i thought we were all going to