Do you know if this is a bts moment or an unscripted M and S moment as I don’t remember seeing it in the episode?

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To be honest, I’ve never rewatched season 10, so I don’t remember if it’s in the episode or not. But I do remember it’s in the BTS, so at the very least, it’s David and Gillian acting and being Mulder and Scully. It’s probably unscripted, but it’s not proper Gillovny, though.