I wouldn't take that bet, because you could very well be right about a tailing loop to come in.
Assuming someone would want to take your bet, I also wouldn't take your part of the bet though, because it also could happen, that the caster would just run out of appropriate line speed at some point, while still keeping smooth enough acceleration. As you said, students are all different and there are a lot of things that may happen next.
About the best German beer, I'll bring you a few, whenever I'll make it to the island!
Most importantly we are all on the same page about how to correct each of the different casting issues. We too agree about one issue causing the next one.
Definitions though have always been a very difficult part between fly casting instructors.
I often have students, who enter the lesson with improper positioning of the rotation. For example they position their rotation along the hole stroke and then in addition typically use a relatively wide arc. So they get too open loops making it hard to wait for the line to unroll. Compensating these issues very likely may be done by starting the next cast a bit early + using extra force. All of these issues easily may support a too sudden burst of power application near the end of each cast as well.
What would be the cause for the tailing loop?
Would it be the improper positioning of the rotation, the relatively wide arc, the bad timing, the over forcing of the hole cast? For me this is a no. It still would be the too uneven force application at the end.
All other issues could be done without causing a tailing loop and the tailing loop could also be done without any of these issues but just the last one.
For me it's same with the too narrow casting arc (not matching the student's abilities) supporting the too uneven force application.
I think, Lasse has made a fair point
Lasse Karlsson wrote:Cool, so if you're good, casting arc isn't the fault, if you're not, it is... Gotcha!
About the clip from above... first step I asked the student to change, was to keep the hole arc while waiting for the line to unroll. https://vimeo.com/60783284