The wrap scene’s the toughest one for this story, because it needs to emerge from what the player characters want to do next. They could, for example, sneak back into the city and kill off the leaders of the warband. They might recruit other magi and form a resistance cell. They might make peace with the invaders and have their crowning moment when they go to Tribunal and are recognised as a covenant. That is, the wrap is a hard one to write for this scenario.
Basically, the story is played outh when the companions have an ascendancy over their foes, and the magi have placed their covenant on a steady footing. I’d like, really, for it to end with them finding a big stash of Earth vis, and using Conjure the Mystic Tower. To me, that seems like the characters finally stamping their mark on the islands.