the crash survivability in the A-Star is very high as are most helicopter crashes. this is definately ground resonance which is inherent to the machine and others like our Schweizer 300CBI. I personally have expereinced ground resonance about a dozen times with out issue. It happens when some of the control linkages wear a bit or if you touch down to hard on the back of the skids. The recovery is simple: if just touched down lift off again - instant fix. If shutting down, keep shuttung down and pull the rotor brake (if equiped.) this A-Star looked like it was shutting down and if you pull the rotor break in bumps it can get into resonance. It looks like unfortunate inexperience or out of tolerance elastomeric bearings. A fortunate design strength that it didn't roll or hurt anyone. Must have been some ride! I couldn't see anyone inside at the controls due to the windsreen glare- anyone know? The forces are amazing!