In aviation, the NTSB attributes 'pilot error' to 90+% of all crashes, since pilots are expected to be aware of the conditions, the capabilities of their craft, and their own limitations and capabilities as pilots. The same can be said for track events, except perhaps HPDE events where lots of untrained drivers are going too fast for their own ability, don't really know the ability of their vehicle, and have very limited knowledge of the track. Instructors can contribute to this because they know what speeds a capable driver will take a corner and are expecting a student to be able to navigate the correct line with their guidance. It is easier said than done. I don't know what happenned at this crash, but EVERYONE should be ansy the first day of a HPDE, esp the green group. CAUTIOUS should be the appropriate attitude, no matter what happenned in this instance or other crashes. SAFETY FIRST! Get well soon Jeff! Let us know if you need anything!! (Best wishes to you too Ken.)