For this, I would ask myself a few questions about the author who supposedly rode with the guy. Questions like how well he knew Billy and how he felt about him. If he had a grudge, or just straight up hated him, he probably most definitely would make up bullshit when writing about him as a big 'F-you'. Also, how late in his life did he write the book? Whether he hated Billy or not, the ravages of time may have done wonders to erode his memories so while he wrote, his brain filled in the gaps not knowing if it were accurate or not (and Billy, obviously, wasn't around to verify, what with him being dead and all.)
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