At only 14 K I'm sure the seatbelt light was still aluminated.
You are correct. If they hit the ceiling it is on them. When I travel when the seat belt sign goes off I will loosen my seat belt a few inches for comfort but never take it off except for going to the bathroom. The air hostess will walk about during the late stage of climb to crusie altitude as they prepare for drink and meal services.
“At only 14 K I’m sure the seatbelt light was still aluminated.”
Also my first thought for both passengers and crew. There is usually a statement in the pre-flight about being buckled anytime you are in your seat. But what’s a couple of crushed vertebrae to a real man who doesn’t need to follow any common sense safety rules, right???
BTW - illuminated.