Thanks a lot for all the comments and advice. For completeness, he lost is composure as he crossed the wak, back foot came out of the RTP and he spun over his front leg, twisting it off. My gut feel just says to me that the biomechanics around a 80 pound child running at high speed must be completely different to that of a 180 pound adult, and that that could also play a eole with release systems. Their limbs given their size and density are also much more vulnerable..
We. Live and ski in Namibia in Southern Africa with limited access to regular coaching and servicing and adjusting of tension mechanisms on release systems, so I am looking for a simple but safer solution, from their the consideration of t-factor front or t-factor double bindings. It is also not that easy to tell kids not to go for that last ball! Other tthan the one example cited above, I would be interested to know whether anyone knows examples of bad injuries (I can live with ankle sprains, but want to avoid ligaments and breaks) with t-factors, as I use a t-factor front and am of the opinion that it will easily release my foot in a bad fall, including a twist out.
We must look at encouraging someone in the biomechanics industry to do a proper study as part of a disertation into boots and injuries, ideally focused around kids given their higher vulnerability.