Pondering the pool and the ritual circle, you consider your options. One option, as Kylek suggests, would be simply to destroy the part of the bridge containing the diagram. This would almost certainly break the spell, but there's a good chance the bridge would collapse, too, destroying part of one of the holiest sites in the Raven Queen's holiest temple. Would She mind? It's hard to say; She is hard to predict.
On the other hand, a counter-ritual, performed atop the original one, might be able to negate its effect without any more destruction. Such a ritual would be difficult and demanding, though, with little margin for error.
Anostor stands on the bridge, and swings his axe a few times experimentally, grinning widely. It's clear what plan he favors.
[sblock=Status]2 success, 2 failure. If you proceed by destroying the circle, make attack rolls along with Endurance checks as primary for the challenge. If by performing a counter-ritual, use Religion and Arcana. The destructive route will have easier DCs, but may have other drawbacks.
Everyone is up. I counted Good Omens as Massacre's act for this round; he still gets his +5 in the second round.
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