In any proceeding brought in a court under section 392--
(a) evidence of any admission or confession by, or other evidence that would be admissible against, an Australian legal practitioner or other person in relation to an act or omission giving rise to a claim is admissible to prove the act or omission despite the fact that the practitioner or other person is not a defendant in, or a party to, the proceeding; and
(b) any defence that would have been available to the practitioner or other person is available to the law society.