Damian still had one more wormhole spell prepared as a backup, it wasn't needed though, the plan was a success with no big complications. Though it was taxing on his mana pool, he had a strong reserve from Vidalia's mana pool, so the drain wasn't a big concern. Besides, he knew he would need the spell soon, as the dome was broken for the spell to work, allowing Moondancer to chase them once more.
They should have brought Moondancer instead of Threadripper. That way, Threadripper wouldn't be able to get this far. But they had the waygate tool, so maybe it wouldn't have mattered much, assuming it could still work with limited power. Plus that one could fly and escape with odds against her.