Any sighting of the elusive Big Cat?

Blue text appears on the ch when you cc into it. Doesn't matter how long the boss how spawned. Someone could be in the middle of hitting it, and you'll see the text. Test it out on an area boss to see proof.

My personal experience with the blue text is horrifically inconsistent, though. Sometimes the boss is there, I'm alone, and the blue text doesn't show. Sometimes the boss is there, someone else is attacking it, and the blue text shows. Personally, I'd check the whole map before CCing, blue text or not.