So I'm laying in Barry's tracks after spending about a week off. My brain just wanted to destroy. Felt about as creative as a turnip (not very).
BUT MAN! Is the looping of Lucy/Samuel a lot of damn fun! Putting in his dialogue isn't as challenging as far as syncing, because he's wearing a mask most of the time, but the challenge is laying in non stop breathing for all his scenes and not letting on that it's the same breaths, and also making them react to the stuff going on. It's like creating dialogue, and really helps the mood.
Samuel is like a force of nature, and even when off screen, you should be able to hear him breathing and reacting, like a lunatic Greek chorus.