With Sylva's not-so-cryptic comment and how Geary has already tweaked to how the Royal Hunt's not entering, I think it would be fair for her to guess at the first half of the translation (Evil may not enter this circle), but not the second half. Which means Geary will likely be working on a plan, knowing that if she can somehow get pushed into the circle, the Stormlords can come in (because she's far worse, as far as she knows), but the Hunt can't. Also she's immediately going to start looking for loopholes in that statement ("How much life needs to be sacrificed? If I cut my hand according to the old ways, will that be enough to keep evil out?")