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If the speed went below alpha prot only when they went below 100ft then offcourse alpha floor was disabled. Did the pilot know that? The Airbus design is such that it is possible to fly hundreds of normal routine operations without much knowledge. I consider that as a positive but the pilots have to understand that if they try out something beyond normal they could be asking for trouble because that requires much deeper study of the design and its implications which is beyond the scope of FCOMs and line pilots. Protections on civil transport aircraft are not built to routinely fly the aircraft on the brink but to save the situation when forced into it by abnormal factors. At Perpignan they planned it then abandoned it and last moment executed it at low level and were not able to handle the consequences.