Dispersion can be cast while stunned, feared or silenced. Clears all snare and movement impairing effects when cast, and makes you immune to them while dispersed.
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Patch 3.1.0 (2009-04-14): Now clears all snare and movement impairing effects and makes you immune to them while dispersed. (Viz http://www.wowwiki.com/Dispersion)