PBY - alpha floor remains operative in normal law with an engine inop until flaps/slats are deployed. Given there's no prior indication of an engine failure it would be interesting to see precisely what triggers the AoA protection to consider an engine failed. In this case with normal law and an assymetrical spool up you'd require one engine to spool up slowly, the system to consider it an engine failure and then drop from normal law straight to direct law (probably the only way to get that sort of pitch up) whilst the aircraft drops below Vmc. Not an impossible chain of events if the landing gear was already down but one would expect some serious ECAM chimes on the CVR to accompany such a sequence.