Yeah I think the thing which threw me off quite a lot was the quick switching of brush size during that part of the video. Things would just move differently, twist in ways I didn’t expect, and sometimes leave ugly dents that I couldn’t correct. I couldn’t see what I did differently from you.
I will give this part another go this weekend at a slower speed, and create a new specific question if I end up hitting a problem. Sorry for jumping into this question 🙂