You have mastered the style of fighting with sword and axe at the same time, and have learned to use this unusual pairing of weapons to pull your opponents off their feet.
Style
Weapon Focus (bastard sword, longsword, scimitar, or shortsword), Weapon Focus (battleaxe, handaxe, or dwarven waraxe),
If you hit the same creature with both your sword and your axe in the same round, you may make a free trip attempt against that foe. (If you succeed, you may immediately use your Improved Trip feat to gain an additional attack against your foe.)