Seeing the though wary, obviously angered expression on Sheilla's face, Daimon inwardly complimented the undead head maid for her perfect timing, before he let the black sea emblem come out to do its job, Rita had already created and invisible layer of mana for Amber.
Which she could use to either hide her from the attack created by the enemy queen, or to forcefully transport Amber out of the battlefield, Rita's mana had the property to not only be incredibly hard to detect, but also to ignore restrictions, so she could pull out such a trick.
Of course, it was a last resort kind of thing, since depending on the level of the restrictions, creating a shadow portal took a toll for her, but the important part is that she was ready to take action before Daimon even asked her to, which is something the latter counted on.
After all, while Daimon had a certain level of "thrust" on the black sea emblem, he never acted without a second and even third plan in mind.