Without Nerodia's help, Rescuing everyone became way more complicated than he wants it to be, taking over the city become almost impossible as well.
Sol was not planning to kill anyone and without Nerodia's help it would be very hard to capture and immobilize a dozen demigod would be a pipe dream, at least if he did not want to put his life in danger.
He could not abandon Tanya in the city as he did not know what might happen to her, she had help Blacky run away and it would anger the pantheon of red smelter, without doubt, there was no way she would get away with a warning.
In the end, Sol went with Blacky the next day so the hell hound could get some rest before another fight.
Outside the city at first light in the morning, the guards were alarmed by a giant fire dog being ridden by a white-cloaked person running toward the city.
It did not take long for a dozen men in armors of fire and metal to come out of the city once they sense the power both of them were exuding.