[Kromm]

The only maneuver that shouldn't be obvious is Feint. Everything else is meant to be stated openly. All-Out Attack would be zero-risk if it weren't obvious, and Concentrate over multiple seconds wouldn't be the drawback that the rules for spells and powers assume it is if enemies weren't aware of it. Another way to put it is as follows: The rules assume that everybody on the battlefield knows everybody else's maneuver, save Feint. If you don't play it that way, certain things become unbalanced.