This is like a claim of assault, and it's been blamed on Rebekah, it would seem. The note explains that there is a requirement of absolutely no real evidence, other than the girl simply saying that it happened, which is important. A historical note shows that no evidence was needed back then. If someone felt they were assaulted in their sleep, or saw it in a vision it was generally accepted, and it could put someone in serious danger. The seemingly obvious logic of the era still has me scratching my head to this very moment.