Question for FE debunkers

This question is about a segment from this vid:
https://youtu.be/7nFwPDZF_Z8

Starting at 20:05, there is some footage taken by a rearward facing camera mounted on an ascending rocket. The rocket spins fast until 21:12, where its rotation slows quickly and stops. The commentator raises the sensible question "What happened to all that angular momentum?"

While I am skeptical of the FE idea, I must say that I do find this video very puzzling. Are there any debunkers here that have a good explanation for what is shown in this segment?

PS. I was a physics major so please don't post any downtalk as if need to have physics explained to me.