You unleash a ferocious volley of attacks, setting aside all thoughts of caution and self-control.

You make a flurry of deadly attacks. After initiating this boost, you can make two additional attacks with each weapon you wield (to a maximum of four 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. You can spread these attacks out among as many foes as you wish.

You must make at least one attack (hit or miss) during your turn to use this boost. It doesn't 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. The attacks granted by this maneuver happen immediately upon initiating it, and cannot be held until later in your turn. 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.