Turned out that with a shortcage rear derailleur and a chain that was a bit short and a 100kg body weight that was a combination that was less than ideal.
So Henning tore off his derailleur hanger. #shit, if you ask me. Henning is fighting quite some adversaries taking up the sport, and I am really sorry for this (but cannot help it any). Mountainbiking is a hard sport, and you WILL fall, and you WILL hurt yourself, and you WILL wreck your bike. Mastery comes with controlling the circumstances, so that if you hurt yourself, you do not hurt yourself permanently, and if you wreck your bike, you are prepared to repair it. A torn derailleur hanger, however, is just about SNAFU.
Since it did not work out, Henning packed up and was off for a BBQ, and we continued tutoring Nick and Kathrin. I was really fond of Kathrin, who is making some huge progress at the moment. She has to overcome some mental barriers still (some anxiety and the plain refusal to do some essential things such as getting accustomed to riding with a lowered seat in technical situations, but as is, her composure and body tonus are way good already.
Lowering your seat in technical situations is not only a requirement of style. It often is crucial for survival, and even on some leisurely and casual rides you always encounter steep inclines where a high seat will ultimately send you over the bars. This is often not easy to understand for beginner riders, why you need a high seat for some situations and a low one for others, but it is an essential technical basic to know when to say when. A lower seat, even if you are not accustomed to it, will offer you more control in steep inclines and when climbing over obstacles.
Folks, it just feels cool to just go out with you, and as I have said on countless occasions - I really look forward to showing you some real rides and to open up the "heart of the wind" for you! But even so, it´s cool to have you around! For this to me is what mountainbike riding is all about: hanging out with some friends at places where it is really cool, pushing your comfort zone and playing around on a bike, and some good foodie afterwards which you can delve into with relish.
Simple. Fun. ;-)