Well, yes, it is a feature of prose, but I am not quite sure how take Hinds' discussion of intertextuality and apply it to prose. This may just be because at the moment my head is in a completely different kind of space (how reusing exempla works as a moral model, which is a different kind of allusion that doesn't necessarily work very well within Hinds' parameters). But it is something I should come back to, and I do think I'd get a better handle on Hinds' ideas (which are expressed through the medium of poetry, after all) if I were elbow-deep in some good old-fashioned Senecan drama.