"Finish off the remaining people, Kaiser! I'll get Dalia out of here!"
Isaac goes for Dalia, aiming to take her out of here, probably using some magic to lift her into the Nomad or something.
Isaac uses a projection to carry Dalia's unconscious body up to the Nomad, leaving Kaiser to finish off the remaining people. With no tentacles or people to stop him he makes short work of it. After the last person dies Kaiser rummages through the corpse of Michelson for anything interesting, coming away with a bundle of papers and the knife used for the ritual. It has several interesting runes along the side and is probably somewhat magical. As the Nomad flies away from the scene of the crime, the tentacles of the Parasite Source stop their constant pushing. Without anyone to power it, the magic circle quickly decays from the mana-sucking tentacles. As the portal collapses the parasite reluctantly pulls its limbs back to whatever hole it was hiding it, leaving its lesser brethren free to reclaim the space it left.
Isaac and Kaiser have more important things to think about, however. Dalia's wound is surprisingly shallow, the cut in her stomach being quite shallow. A couple of stitches by a competent surgeon should be all she needs to recover. Assuming that she lives that long, for she doesn't seem to be breathing and her pulse is non-existent. Obviously she was hooked up to all of that medical equipment for a reason, though what that reason could possibly be isn't immediately obvious to Isaac. Still, if she's to last long enough to return to Northsdale something has to be done immediately to keep her alive.
((Yeah... To be honest I wasn't expecting the Nomad's AoE attack to completely wreck the tentacles. Oh well. At least it means that the plot can progress some more.))