Stop saying you can "spam" arm of the destroyer. You can't.... The silence only goes off if you're coming from 3rd stance (opo opo). Even if u used pb and "spammed" it, the silence effect wouldn't go off, just like you can't "spam" boot shine from the rear and get 100% crit. Since arm silence can only be utilized as the fist hit of a 3 move combo, it's unreliable at best since that portion of the combo would have to align with the casters cast, or you'd have to delay the use of your abilities,, which would net a dps loss or worst a chance to drop GL3. Bottom line is arm of the destroyer is trash