Scott,

Well spotted.
Most materials I tie off get tied off with a 'U'-locking turn, which makes it bomb-proof on the initial thread wrap. The relatively flat&wide, and slippery, stripped quill does not allow this as easily, and this more conventional locking down shown in the clip included some operator error

Btw - this was but one of four moments in the clip where there is some room for improvement. The Shadow knows...

Cheers,
Hans W