82,000 fs. I was thinking "Wow ! Mach 75!"
Flashes at 9:13 ff. Once again, velocity = temperature.
We've had some discussions about bullet flashes on impacting things even though none of the materials contained iron. I know I've seen flashes from my .243 striking plain old rocks in the gloaming.
Ultra-high velocity stuff (and the attendant shock wave) is funny, hence the popularity of ultra (infra?) slow motion, but the main thing here is that velocity = temperature and that temperature = velocity.
Terry, 230RN