精准伤害没有只能触发一次的限制，致命喷吐是龙魔法3环，可以把线型喷吐或者线型法术变成锥形
以下是万律关于精准伤害的说明：
劇透 - :
PRECISION DAMAGE
A number of abilities in the game allow a creature to deal extra damage by striking a vital area. This category of abilities includes sneak attack and other abilities that work like it, such as a ninja’s sudden strike (Complete Adventurer 8) and scout’s skirmish (Complete Adventurer12). For the sake of simplicity, the extra damage
such abilities deal is referred to as precision damage. Several factors are important to keep in mind regarding this sort of damage.
• Precision damage applies on any attack that meets the requirements of the ability that grants the damage. This includes multiple attacks made during a full attack. If conditions somehow change between multiple attacks, attacks that not longer meet the ability’s requirements can’t deal precision damage.
• An attacker can deal precision damage with any weapon he can wield, but he must wield that weapon in the optimal way. If an attacker takes the –4 penalty to deal nonlethal damage with a lethal weapon, for example, no precision damage is possible.
• Ranged attacks can deal precision damage only if the range is 30 feet or less.
• Precision damage applies only against living creatures that have discernible anatomies. Undead, constructs, deathless, oozes, plants, and incorporeal creatures are not subject to precision damage, and creatures that are not subject to critical hits are not subject to precision damage.
• To deal precision damage, the attacker must see (or otherwise sense) the target accurately enough to pick out a vital spot. Any degree of concealment foils the ability to deal precision damage.
• To deal precision damage, an attacker must be able to reach the target’s vital spots. If the attacker can’t do so, he can’t deal precision damage.
• If the bonus damage from a precision damage ability is expressed as extra dice of damage, the damage from those dice is never multiplied when the attack receives a damage multiplier (such as from a critical hit).
• A form of attack that enables an attacker to make multiple attacks during an action other than a full-round action, such as the Manyshot feat (standard action) or a quickened scorching ray (swift action), allows precision damage to be applied only to the fi rst attack in the group
我个人认为这段有两个错误
1）回旋飞刃不是rc中定义的weaponlike spells
具体的说，rc中定义其为ranged或touch法术
其中range法术包括
1.range touched spells远程接触法术
2.act range weapon and required ranged attack 如远程武器一样使用远程攻击
touched法术包括接触法术
以上都与回旋飞刃不符
2）拔刀术伤害不属于rc的精准伤害，没道理被rc中描述精准伤害的词条限制
另：假若你的DM强行认为拔刀术属于精准伤害，进行规避亦不难，只需将超魔专长和UMD超魔改为双武器战斗和双魔杖施法即可，双魔杖施法启动两个魔杖是整轮动作并共计消耗4发，效率更高，选择标动拔回旋的单手仅仅为酷炫
