You swing your weapons about you in a blur of speed, making a series of devastating attacks in the space of a single breath.

You make a flurry of deadly attacks. After initiating this boost, you can make one additional attack with each weapon you wield (to a maximum of two extra attacks if you wield two or more weapons). These extra attacks are made at your highest attack bonus for each of your respective weapons. All of these attacks must be directed against the same opponent.

You must make at least one attack (hit or miss) during your turn to use this boost. It doesn't matter if it's a full attack, an attack action, a maneuver's effect, or an attack of opportunity, all that matters is that you attacked an opponent during your turn before you used this boost. The two weapon fighting penalties do not apply to the attacks granted by this boost. For example, you can't initiate this boost and then take a Charge action, then apply the boost's effects after the charge. You'd have to initiate this boost after charging.