Lanyon and Frankenstein have an odd dynamic. This might actually be the first time they've interacted? I'd written several short scenes between them before, but they were always the first thing cut because, well, they just don't have much to say to each other. Frankenstein is more of a symbol to Lanyon, a physical manifestation of Jekyll's strange, self-destructive compulsion to do science. But it's hard to have a conversation with a symbol.
Have you ever had a friend, and that friend just has this tortured, fire-and-ice relationship with someone you don't know very well. Your friend is always coming to you freaking out about some awful thing this person has said or done, and you're like, "Dude, why do you put up with them? All they do is cause you grief. Just cut it off!" But your friend never does, because there's some deep, complicated emotional baggage they can't easily disentangle themselves from. But you don't have any of that baggage, or any connection with this person whatsoever, so whenever you see the them, you're just awkwardly standing around like, "Whelp, I've heard all this bad stuff about you, but it's not really my fight to pick, so I guess we'll just have an awkward and polite interaction." That's Lanyon with Frankenstein.