Hi Michelle! And thanks for stepping in here. My impression with the report text is that the bus driver actually stopped the bus and both she and the witness (who apparently moved closer to her) had a good look at the foot and the hair around the ankle and on the surface next to it. Your text said that she did have to start moving the bus so both witnesses did in fact have a good look at the foot and the fact that it was very large and oriented in a way that told them that the body was face down. It's only after rereading the whole thing several times and collecting all of those small details that one really get a good picture of how things transpired. All of those small things added together makes it super difficult to think that this incident as reported didn't happen.
And, YES! I'll bet you would INDEED like to speak to the bus driver