"That does seem unlikely," Siebren agrees. While he's likely suffered more frequent near-death experiences than the average physicist, a possibly-demonic alteration to his internal systems is somehow the simplest explaination on hand.

"You know me quite well, from what you've explained. Do you believe it is possible I intended for this to happen? I can't think of anything that could be gained by destroying my own records, but there are so many unknown values now. There will inevitably be factors I have overlooked."