02:10:51 AoA=6 deg, stall warning triggered
02:10:53 AoA=7.5 deg, buffet onset
02:10:57 AoA=10 deg, deterrent level of buffet reached
With severe buffet at 02:10:57, the Captain would have felt it too. He must also have noticed an unusual, continued climb >1/2 min before that.
So why didn't he return to the flight deck earlier than 2:11:40, and should he even need a briefing from PNF to connect those dots?