I carelessly forgot to put the link: The question starts at 2:42
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lawsantaThen she responds with some lightning fast gibberishI agree. I can't help you. I thought I might have heard, "Yes, I have. I was just gonna ..." and the rest is lost until the man says "back to. That's fine."
I think either David has spotted Lucy has missed shaving part her left arm and armpit as opposed to an otherwise well shaved right arm maybe, or more plausibly David has a copy of her lecture in front of him, and he realises she left a note out.