Lorien tells Katharine about shared delusions, she proves she is bad at a French accent, and they self diagnose.

Sources: 

https://en.wikipedia.org/wiki/Folie_à_deux#cite_note-JNMD1956-6
https://www.psychologytoday.com/us/conditions/delusional-disorder
https://www.news-medical.net/health/Delusion-Types.aspx
https://en.wikipedia.org/wiki/Charles_Lasègue#cite_note-14
https://www.psychologytoday.com/us/blog/the-red-light-district/202204/what-everyone-should-understand-about-shared-delusional-disorder
https://www.webmd.com/schizophrenia/shared-psychotic-disorder
https://pubmed.ncbi.nlm.nih.gov/31095356/#:~:text=Shared psychotic disorder (folie à,based on a delusional belief.
https://www.psychiatrist.com/pcc/folie-a-deux-case-husband-children/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1559622/
https://www.aetv.com/real-crime/folie-a-deux-murders
https://en.wikipedia.org/wiki/Ursula_and_Sabina_Eriksson
https://web.archive.org/web/20140111185624/http://www.stokesentinel.co.uk/woman-free/story-12531980-detail/story.html#
https://en.wikipedia.org/wiki/June_and_Jennifer_Gibbons
https://www.buzzfeed.com/ryanbergara/this-is-the-story-behind-the-disappearance-of-the
https://www.dailymail.co.uk/video/news/video-1326183/Tromp-children-explain-left-family-vehicle.html
https://www.dailymail.co.uk/news/article-4284496/Tromp-family-normal-bizarre-trip.html
https://www.bbc.com/news/world-australia-37293494

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