Improved Awesome Blow (Ex)

At 20th level, the brawler can use her awesome blow ability as an attack rather than as a standard action. She can use it on creatures of any size. If she rolls a natural 20 on the combat maneuver check, the brawler can immediately attempt to confirm the critical by attempting another combat maneuver check with all the same modifiers as the previous one; if the confirmation roll is successful, the attack deals double damage, and the damage from hitting an obstacle (if any) is also doubled.