'At 2 h 06 min 04, the PF called the cabin crew, telling them that"in two minutes we should enter an area where it’ll move about a bit more than at the moment, you should watch out". Do we assume that the seatbelt sign was on, and the passengers were told to take their seats? Was the going so rough that the FA's could not be seated? (Okay maybe some were sleeping). With about 5 minutes to go before v/s became negative, I would have thought that they could have been belted in. But with so many passengers found unseated, I wonder if they were able to due to the aircraft's movements. What a way to go, poor souls!