a Simple Explanation comment by cyd:
If I understand the video illustration correctly, the twirling torus illustrated on the left precesses about the axis like a wobbling top. At some point, it stops wobbling and freezes in a particular spatial orientation, as illustrated by the torus on the right. In the paragraph above by Dr Dylan Nelson, this evolutionary shift is when star formation ends and only old, resting stars remain.
This mechanism could be similar to what happens at the sub-atomic level with the tiny tori at the center of each sub-atomic particle. It may be that the tori bubble up as proto-energetic forms, twirling about their axis until the "spaghetti gets tangled" coming out of the exit jets and they then freeze in orientation and range of motion. i.e. they tiny toroidal "black holes" at the center of every sub-atomic particle freeze into apparent solid matter at the point when they settle into the fixed polar orientation.