The reference to the captives of Philippi is an example of which of these literary terms point of view allusion antagonist paradox?

Well honey, that's an allusion for you. It's like when someone drops a subtle reference to something else, in this case, the captives of Philippi. It's not an antagonist or a paradox, just a little nod to history or literature to add some flavor to the story. So, there you have it, allusion is the name of the game in this scenario.