Section 819(1)(b) of the Corporations Law applies wherever a client reasonably believes a representative is acting on behalf of 'some person' whether or not identified; it does not require the client to believe the representative is acting for a specific identified principal. A third party joined to proceedings is a 'party to the proceeding' for the purposes of s.819(4). The presumption in s.820 operates in favour of an indemnifying principal seeking to invoke s.819(4), and where there are only two indemnifying principals, proof that the representative did not act for one, combined with the presumption, is capable of constituting proof that the representative acted for the other.
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