Kate's still behind a tipped over table for cover waiting for a moment of opportunity to take down the TANDEMs and Steph hasn't established what she's doing yet.

Unless Damian got stuck under the pile of socialites he presumably snuck down to the cave to change into Robin. I had an entrance idea for him if the fight continues, but I'm not sure if that happens if the TANDEMs blow up a good portion of the manor.