 At least for the pathetikoi, the context seems to be medical. But is it the case for “each other person to the extent that she shares in those emotions”, i.e., notably the spectators of tragedy? When Aristotle refers to “a certain katharsis” (tina katharsin), he may mean either that all these people, the pathetikoi as well as anyone else, undergo the same sort of medical katharsis, or that they each undergo a different sort of katharsis.