Though Frost had immunity to ice damage that was all relative to his natural strength. If an S-rank monster such as Maya cast high level ice magic at him, he could still be hurt, frozen and even killed. This earth rank flame was something that was capable of freezing even Frost, it was of a higher quality than him at the moment.
She couldn't help but frown and instinctively move in close to protect her young master, but she was shot down by a look from Dark. Basically, translating as 'calm down lass, I'm not that stupid'. Dark then conjured up his divine magic and encased the flame in a seal, as though freezing it in a diamond of solid mana. The temperature in the room swiftly returned to normal.
