What is the gist of the cause of action in an anti-SLAPP action?

cause of action, not the gist of the cause of action. [] Furthermore, while it is often said that the first prong of the anti-SLAPP analysis calls us to ascertain the 'gravamen' of the cause of action, for anti-SLAPP purposes this gravamen is defined by the acts on which liability is based, not some philosophical thrust or legal essence of the cause of action." (Id. at pp. 1189-1190; see also Tuszynska v. Cunningham, supra, 199 Cal.App.4th at pp. 268-269 [trial court erred by conflating defendants' motive in a discrimination case with the conduct itself].)