Thanks to all of you for your replies. Mollis is a very nice show and I recommend that you make it there next time around, which is probably in 2021 or 2022. Next time I will try that clearing up on the mountain on the other side.
Guess I was just lucky with the first one capturing those shockwaves in the right moment. As for the panning shots: Rest assured, trying to get these means setting the camera to the highest frame rate possible, trying to fokus one point and keeping it steady but still accepting that 95% are just blurred in one way or another - but it is the 5% good ones that I am after.
Cheers,
Joerg