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Rage - WoWWiki - Your guide to the World of Warcraft

Rage can be generated with several different methods. The primary cause of rage generation is by being attacked, which varies based on damage taken. Attacks that are blocked, parried, or absorbed (as with Power Word: Shield) also generate rage. The druid feral talent Natural Reaction allows druids to generate a fixed amount of rage when they dodge.
HAbla de recibir daño, no de ataques que hace el warrior

Dealing damage to enemies by regular melee attacks generates rage based on damage dealt; however, special attacks against an enemy do not generate rage. Attacks which damage a shield (such as PW: S) but not the opponent themselves do not generate rage.
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Patch 3.1.0 (2009-04-14): Attacks that are absorbed (such as by Power Word: Shield) will now generate rage.

En definitva:

PEgarle a un shield o absorb genera rage aunque no hagas daño real al adversario