协助他人的描述是一个近战攻击检定，这个攻击检定是否可以造成重击威胁呢？
如果可以是否可以在利用彩蝶毒蛰将这个重击转移出去？
彩蝶毒蛰描述的“你的此次攻击造成普通伤害”如果对应一次没有伤害的攻击会导致专长无效吗？
Aid Another
Source PRPG Core Rulebook pg. 197
In melee combat, you can help a friend attack or defend by distracting or interfering with an opponent. If you’re in position to make a melee attack on an opponent that is engaging a friend in melee combat, you can attempt to aid your friend as a standard action. You make an attack roll against AC 10. If you succeed, your friend gains either a +2 bonus on his next attack roll against that opponent or a +2 bonus to AC against that opponent’s next attack (your choice), as long as that attack comes before the beginning of your next turn. Multiple characters can aid the same friend, and similar bonuses stack.
You can also use this standard action to help a friend in other ways, such as when he is affected by a spell, or to assist another character’s skill check.
Butterfly's Sting (Combat)
Source Inner Sea Gods pg. 208, Faiths of Purity pg. 24
You can forgo a critical hit in order to pass it on to an ally.
Prerequisites: Combat Expertise, worshiper of Desna.
Benefit: When you confirm a critical hit against a creature, you can choose to forgo the effect of the critical hit and grant a critical hit to the next ally who hits that creature with a melee attack before the start of your next turn. Your attack only deals normal damage, and the next ally to hit the target automatically confirms the attack as a critical hit.
Critical Hits: When you make an attack roll and get a natural 20 (the d20 shows 20), you hit regardless of your target's Armor Class, and you have scored a “threat,” meaning the hit might be a critical hit (or “crit”). To find out if it's a critical hit, you immediately make an attempt to “confirm” the critical hit—another attack roll with all the same modifiers as the attack roll you just made. If the confirmation roll also results in a hit against the target's AC, your original hit is a critical hit. (The critical roll just needs to hit to give you a crit, it doesn't need to come up 20 again.) If the confirmation roll is a miss, then your hit is just a regular hit.