Pummel is a core warrior ability learned at level 24. It is a single target instant attack and debuff. It does no damage, but if applied during a target's 'casting' charge-up, will make the spell fail and prevent casting of any spell in the same school for four seconds. It has a 15 second cooldown.
Use: Permanently teaches you this glyph. Successfully interrupting a spell with Pummel increases your damage by 6% for 20 sec.
Sell Price: 1
Notes
Most outdoor PvP raiding is too hectic for this to be that useful, but in a one-on-one PvP duel, this is definitely a match winner for the otherwise magic-vulnerable warrior.
With the release of Patch 3.0.2, Pummel has come off the Global Cooldown. As such, it now allows for a lot more latitude.
Past changes
Patch 4.1.0 (26-Apr-2011): Now usable in all stances. Replaced Shield Bash for all warriors.
/Patch 3.0.2 (14-Oct-2008): Pummel now only has one rank, no longer causes damage, and is no longer affected by Global Cooldown.
Patch 2.3.0 (13-Nov-2007): Interrupting a channeled spell with this ability will now always properly prevent casting spells from the same spell school for 4 sec.