I'm currently building a Scimitar duelist fighter in 4e, and I'm using the Desert Moon Swordmaster Greater Style (MPII114). One of the benefits of this feat is that it allows you to use dance of steel (PHB79) in place of a melee basic attack when an enemy triggers your Combat Challenge feature.
My question here is: when that feature is triggered and I use dance of steel (or one of the other powers tied to that feat), is that power expended? Can I use it as a standard action again in the encounter? Can I use it again if the feature is triggered again?