Nick I stand corrected.
Initially when viewing the video, it appeared, to me, that the second aircraft was yawing in the opposite direction. However, I now see that both aircraft were on the same profile.
I see what you’re saying, determining ‘cause from effect’, tricky!
Although I will continue my propensity for rash decision and snap judgments!
'Never let it be said that I allowed cold, hard fact or logic get in the way of considered opinion!'