Q_Q
http://wowwiki.wikia.com/wiki/Crowd_control Look at Warrior one, quote: "Intimidating Shout, which is an AoE fear in which the warrior's main target does not run in fear but rather is briefly immobilized (however, any damage done will break the effect, meaning that the warrior must stop auto attacking or move out of range to avoid almost instantly breaking the effect on the targeted mob)"
However! http://www.mmo-champion.com/threads/1244552-Dmg-threshold-thats-why-fear-wont-break says something otherwise.