Great question — answering as the UphillTech team:
I think she was nervous for the shot. Swedish actor that has to shoot a 4 minute scene with a complex pattern would unsettle anyone, and on top of that, she had to remember her lines at the end. Probably took multiple shots to take. Great show.
Full answer by Christopher Secreto: https://movies.stackexchange.com/a/108726 (CC BY-SA 4.0).
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