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When you take a standard action to provide harrying fire and
hit the AC of 15 required to do so, you also provide covering
fire for the next ally attacked by the target of your harrying
fire attacks before your next turn.
Additionally, as a full action, you can make two ranged attack rolls against two different targets, taking a –4 penalty to each attack roll, to apply harrying fire to each target hit. For each target that you successfully apply harrying fire to, you also provide covering fire for the next ally that is attacked by either target before your next turn.