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OUT-OF-TURN DODGE
Any time you are about to be attacked, you can give up your next turn to gain a +4 dodge bonus to your AC. You must be able to apply your Dexterity bonus to your AC against the attack (so you can’t use it when flat-footed, for instance), and you declare this before the attack roll is made. Your initiative does not change; you simply do not take an action on your next turn. You gain this dodge bonus until the next time your initiative comes up after your “skipped” turn.
This rule gives a character the option of defending himself, providing an additional element to combat tactics. It also provides adventurers with additional tactical options, such as a “wolf pack” tactic: When a group attacks a single target, whoever the target retaliates against uses the out-of-turn dodge to aid his AC, while each of the others attacks the opponent on his or her turn.
–Andrew Finch