AndyGov
I am a simple jockey and no AB freak, so i stand to be corrected or hanged by the lobby, but here is my understanding of the logic:
The AB is flown with the "demand" philosophy. You demand a track/vector/movement with the stick and the computer executes it (you let the stick go after the demand input, the demand is maintained and must be cancelled with a opposite demand). On final the demand law fades out to direct law on the pitch, meaning the stick input gets back to conventionally executing directly what input you give, irrespective of the outcome of the command versus space (you let the stick go, the elevators go back to neutral). However the roll axis remains in the demand mode. If you kick in some rudder, the computer senses a deviation in space contrary to the initial demand, and wants to correct it thus applying some roll.