From BEA's Final Report, para. 2.2.5:
In the specific case of alternate 2B law, some coefficients used in the longitudinal flight control law become speed-independent and are set for the maximum speed for the aeroplane configuration (330 kt in clean configuration). This hardly modifies the behaviour of the aeroplane in comparison to normal law, but can nevertheless induce an unusual response dynamic when the aeroplane has an abnormally low speed for the configuration.
Nevertheless, the pitch attitude reduces from 8.5° NU to 2.5° ND in about 6 seconds. (The Nz law uses a mix of Nz and pitch rate in its feed-back term).