Can be used to interrupt spell casters, although Feral Charge will also work for that.
This ability is also often used by druids without Nature's Swiftness to make time for a safe heal.
Patch changes[]
Template:Patch 3.2.0
Hotfix (2009-06-08): "When immune to the stun of following abilities, Maim, Bash, and Hammer of Justice will no longer cause player spells to be interrupted but they will still interrupt NPCs. Also, when these abilities do stun a player target, they will not perform an interrupt effect and lock out the affected magic school. As an example, if a Mage is channeling Arcane Missiles and is hit by Hammer of Justice, Blink will now be available as the Arcane school will not be locked out as it was before."