They've already displayed their move. Big walls on bitfenix and huobi in the $300 to $400 range piled up as we dropped. So far they aren't totally out of ammo, But the walls are beginning to fail.
Panic will likely happen at $300, whenever it comes, but it will be relatively unresisted compared to now.
what makes you think that they are out of ammo? possible "they" ain't showing everything "theeeey" got. no need to show your full force when a fraction of it is enough to cause a desired movement