Maybe it is to see Rose, though they didn’t go to see JoAnna, but perhaps it has to do with WL too? Don’t they film concurrently, and maybe Barbara Hershey is filming too? Also they are writing 3×19 so perhaps they want to touch base with the actors /directors about it, so just a good time to arrange a trip up there to check on things.
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“If I had a world of my own, everything would be nonsense. Nothing would be what it is, because everything would be what it isn't. And contrary wise, what is, it wouldn't be. And what it wouldn't be, it would. You see?” -- Lewis Carroll, Alice's Adventures in Wonderland & Through the Looking-Glass