Hi,
The central question is : Why on earth did they get themselves into this and how ?
BEA has pretty much nailed it : the least experience pilot pitched a whopping 10 deg up without applying power !!! and the most experienced, instead of keeping his eyes on attitude and whatever was left, chose to turn his gaze elsewhere to call the captain to the flight deck.
The failure was never recognized, therefore the adequate checklist never called for.
How could anyone of these 2 ever realize they had stalled when awareness was at its rock bottom from the start ?
I think the answers to your questions are in the BEA N°3 report ...
The PF made a announcement to the cabin personnal about turbulences to come
The PF was not belted on his seat (nothing .. completely free)
Are this a normal or professional behavior of a responsible pilot ?
My answer is no
What you can expect from such seriousness pilot in case of an emergency situation ?
The AF447 tragedy