The seals had been broken
It was also because Freya and Dylan knew that they would take their opponents by surprise with this new way of fighting that they had not been more worried than that when the seals trapped them in this room.
Of course this didn't stop Freya from worrying about her husband, but she was a Warrior above all, and her personal feelings always took second place during a confrontation, if she wanted Dylan to be safe, then she could only focus on her opponent and get rid of him as soon as possible, she couldn't let her feelings distract her.
The superior Demons who were fighting Dylan then backed off when they felt his change of power… And that of his red flame too, which changed her appearance after the boost she had just received, and she now looked like a fairy teenager.