Ok so here is what I have then. Once the Players Gate in they find a teleport circle that allows them to move as a swift action up to their speed per turn. They utilize that to get the villagers to the gate (move speed is 30 and they can run double that for a total of 90 so maybe make the gate 100 feet away? Otherwise there wouldn't be any risk of the villagers being hit.) And once all the villagers are out the boss comes out.