Think you are being a bit harsh there Dozy calling it 'rubbish', unless it's about the possibility of a female on the FD in which case fair enough. the Cpt didn't return with a 'what do you want', or 'what's the problem', or 'can't I leave you for even 10 minutes without calling me back'. His opening gambit is entirely consistent with him challenging the crew about a situation he has discerned himself and not with being summoned back.
Relevance as to where he had been ? Well if it was a mandatory rest break and he wasn't resting: whether other factors bore on his decision as when to have his break: whether 'social' tensions affected CRM (including his choice of who was to command): the mental alertness/fatigue arising from how they spent the stopover, etc.
On the AoA, a continuing stall warning may have helped the Cpt diagnose the situation but there were sufficient other factors surely, even excluding the period when it did warn. Wouldn't be excoriating the design on that one.