Originally Posted by
Machinbird
Dozy, they didn't know that.
...
It was not an error to deploy the speed brakes when PF did so.
The error was letting PNF cow him into retracting them prematurely.
I understand what you're getting at, but at the same time the PNF seemed to be aware that they had an unstable aircraft - unfortunately we don't (and will never) know if at any point he suspected stall. I'm not an aeronautical engineer, so I don't know what effect throwing out the speedbrakes would have in a mushing stall. I doubt it would be positive.