I have been in a couple.
One was a "crash" but as no one died and there was not a hull loss it was determined to be an "incident". Have also ahd a couple of confirmed bomb threats on board and made expeditious landings and deplaning of pax, followed by a search of the aircraft. None of these are very much fun and certainly get you thinking about your own mortality and what you hold dear in life.
The truth is it is very hard to determine how any individual will be in any given circumstance if they have not been "tested" before. The fight or flight is a basic human response and is primal. It is what has kept us alive as a species. Many do not do well and I would be the last to judge anyone.
As for the ground response, at times they are good and others are found woefully wanting.
I am not comfortable going into great detail here but please feel free to contact me should you wish to discus thurther.
Joe