 I want to get you into some other doxastic state. Getting you into the “the pants of the guy addressing me are on fire” state would likely do the trick, as would getting you into the “Andy’s pants are on fire” state. The communicative effect of saying “my pants are on fire” is not what would be predicted by a view on which that sentence’s conventional communicative role is to ensure that both speaker and addressee are in the “my pants are on fire” doxastic state.