Defensive Throw

(Complete Warrior, page 97, DnD 3.5)

[General]

You can use your opponent's weight, strength, and momentum against her, deflecting her attack and throwing her to the ground.

Prerequisite

Combat Reflexes, Dodge, Improved Unarmed Strike, Improved Trip, DEX 13

Benefit

If the opponent you have chosen to use your Dodge feat against attacks you and misses, you can make an immediate trip attack against that opponent. This attempt counts against your allowed attacks of opportunity in the round.