but he never hears what she says - because a whining sound fills the room , low at first , but increasing - the driver hears , too , turning toward the passageway that extends deeper into farther rooms - where the sound is coming from - swiftly growing louder - they see the driver make to run - but not fast enough - as the black van flies out of the deeper passageway , slamming into the driver at extraordinary speed , so fast one of its legs is knocked right off its body .