48° AoA is massive. Many test pilots have never been there. No modern Jet transport has ever been there in a controlled and monitored environment, so absolutely no data is available.
It is very questionable whether there were any "correct responses" in that situation. I also tend to believe that this was it, once they got there.
Why? The Airbus cannot enter deep-stall like some of the 1960s high tail designs. With the controls centralised and throttles cut, surely it would eventually pitch nose down like any other aircraft?