Eh, I could be wrong... and you Co-GM's would be better suited to judge this,
But I think KoL was attempting to separate the marketplace with their earlier post when they split the market place into A&B. I'm suspecting that the 'guttural howl' would be heard off in the distance, and that alone would probably cause a fair bit of panic... but I doubt the people in district A can intervene in district B.

No idea where Cass/Sienna are situated, but if you put them closer to A... it's not too hard to believe Cass would be too infatuated to pay the occurrences on the other side of the markets too much attention. It's a bit hard since your post also mentions Mary's rock. But eh, could be altered?

Sort of matters since Darrel and Echo are in the same area. (GM's congregating away from the players~)
As for my idea, I might head back over to Mary's Rock group now~
The post was good, but the Behemoth is irresistible xD