Sorceress in Malory

[scarfman]

I'm certain I recall encountering, within the past two years, somewhere in the Morte previous to the Roman war, a passage of not more than a paragraph or two in which a sorceress attempts to entrap Arthur, and/or pines away for his love. But now I can't locate it, at least not in the online Caxton edition where I usually go for referents. Can anyone else recall this passage, and tell me where to locate it? (Is it perhaps only in Vinaver editions?) Thanks.