Kerkly finishes preparing the Plane Shift, but before that point, I assume that Ares does whatever he is going to do, other than run through the girl. If Kerkly and Parker are still alive by the time I finish, I survey the battlefield before casting.
I call the 16 Archons to me while this is going on and have them Aid Parker and I once they reach us. Once Ares arrives, they flee. If he leaves, they return to me.