Duke Arsena, faced with a significant threat, remained calm.
As the lord of Storm City, he understood that he had to do everything within his power.
"I'll head to the city walls immediately to fend off the demons' assault. If you find this situation too perilous, feel free to retreat. You've already provided ample assistance. Asking you to stay in Storm City and fight with all your might would be too much. You've completed your quest and may return to the capital of the Empire."
Duke Arsena didn't expect Natasha to stay and defend Storm City with him, seeing the dire circumstances.
It was clear to him that they stood no chance against a Devil's onslaught with just the two of them.
In such a situation, Duke Arsena could only suggest that Natasha leave first, given her status as a guard general sent by the Northern Myst Empire.
She had the option to leave without any complications.