In any proceedings against a person for a contravention of rule MAM-3.2.1 in relation to a purchase or sale of securities that did not involve a change in the beneficial ownership of those securities, it is a defence if the defendant establishes that the purpose or purposes for which he purchased or sold the securities was not, or did not include, the purpose of creating a false or misleading appearance with respect to the market for, or the price of, securities.