Being in Front of Something Without Noticing It
"I know that this is an Enslaving Altar Formation, but how do you plan to rescue her? Moving her by force is dangerous, or at least that was the information that expert told me. However, if we break this formation before rescuing her, we will be surrounded before we can escape and it wouldn't ensure that Ange will be safe either."
Yale's father had obtained some knowledge about the Enslaving Altar Formation, but it was also rather basic, and the only important pieces of information were the danger of moving someone away from the formation without stopping it, the risks of stopping it, and how to stop it.
"Can you explain what part of moving her away or stopping the formation is dangerous?"
If the danger was just that the formation would attack them or something of that style, Absolute Protection was enough to save them; even if Ange were in direct contact with the altar when it attacked, she wouldn't be harmed.