The Order of War and Flame didn't do some routine like issue announcements when events or large celebrations were underway or approaching rapidly—they used the Flame to convey messages.
Some of the Order, after all, were Unspoken—past Champions of the Cullings. They could not speak, so their only form of communication was delivering messages through the connection they had formed through the Flame.
Kieran didn't know how that nifty system worked, but the vile Flame somehow managed to deliver a message to even him in its warded-off condition. It inundated his Realm of Self despite the enforced limitations.
That both alarmed and awed Kieran. The Equality Gate—which is what Kieran called his altered Mystic Gate for the time being—was his defense against the Flame.