Whow, and less than a minute between the PF call for FLAPS 30 (56.32) and the stall (57.26 ) , Except for a mention of the brief single master caution at 56.36 . Looks like they both never realised the props were feathered and wondered why they did not get power when pushing the thurst levers.
Someone with ATR72 experience can maybe explain this sequence and unnability for the crew to notice the conditions of the props.