It's a quick break from the Clavijo storyline for some Halloween material. Specifically, this is a story from the Icelandic Eyrbyggja, the Saga of the People of Eyri. In it, a stranger comes to Froda, blood rains down, and the dead rise up to trouble the living.
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Sources:
Gisli Sursson's Saga and the Saga of the People of Eyri, translated by Judy Quinn & Martin S. Regal. Penguin, 2003.
Joynes, Andrew. Medieval Ghost Stories: An Anthology of Miracles, Marvels, and Prodigies. Boydell, 2006.