Originally Posted by
Birdflies
The skill shortens the attack duration on mobs. This is very easy to test: grab 2 identical mobs, cast it on only one of them. You will see how the mob that has wind-lore on it will pull ahead of the other one, and once they are back at the same spot, it will again pull ahead.
However, maybe this is working as turbine intended. Maybe they thought that this way it would discourage lore-masters to mindlessly place all debuffs on all mobs. After all, if the enemy is ranged, it is still well worth it to place this debuff, the 50% damage reduction totally makes up for the speeding up of the attacks. On the other hand, lotro-wiki has a different tooltip for the skill, which says "+10% attack duration". So this is probably a bug.
Until it gets fixed, probably best not to cast it on melee mobs :P