Still a very interesting thread over here !
I couldn't find the info in the A330 FCOM but maybe some of you have the answer:
It seems that the PF struggled with lateral stability issues.
In normal law operation, not only the ailerons but spoilers except #1 might be extended depending on air-speed to increase the rate of turn.
How would the spoilers respond in alternate law when full-lateral-stick deflection is applied and speed is missing/incorrect ?