It's an ability proc (ie. you have to press it to use it), what it does is it lets your devastate and heroic strike have the ability to refresh your shield slam CD so you can SS again. There is no new "button" or "skill" so to speak. When Sword and Board procs, you'll hear a blocking sound, and Shield Slam will immediately finish its CD.
Alternatively you can configure addons like Mik's SCT to flash a sound alarm or big text across the screen to alert you to use it. There is a thread on that in the UI section.


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