Purchasing Shatter and Stun Limb

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A player in my chapter asked a question about being able to purchase Shatter and Stun Limb per the letter of the rule in the ARB v1.1. Since the letter of the rule is inconsistent we interpret it locally as a "mistake" in the wording. But, for consistency, we would like a National ruling on the subject.

Okay, so here is a weird one. I am using the ARB 1.1

Wording from the book under skills

Skills listed with a * can be bought multiple times to improve or increase the skill. Read the description carefully

Disarm*: ...This skill can be purchased every time a character has purchased a Weapon Proficiency or Backstab...
Riposte*:...A Riposte may be purchased once for every four Weapon Proficiencies or Backstabs...
Slay*:...A Slay may be bought once for every two Weapon Proficiencies. (After Weapon Proficiency +2, +4, etc.)...
Shatter*:...This skill can be purchased once a character has purchased Three Weapon Proficiencies or Backstabs...
Stun Limb*:...This skill can be purchased once a character has purchased Three Weapon Proficiencies or Backstabs...

So my question is this. By the book it would seem that I am able to purchase any number of Shatter's or Stun Limb's that I can afford once I have purchased Three Weapon Proficiencies or Backstabs. Is this true.

Information leading to this:
Disarm qualifies it as every time the other skill is purchased
Riposte specifically calls out that it may be only purchased once per four of the other skills you have
Slay provides an example after putting the same qualifying language
Shatter and Stun Limb have no qualifier. They just state that it may be purchased once you meet the minimum requirement which seems to be three

Is this something that was purposely not updated (or not necessary to be updated) with the new rulebook? Was it intentional? Is it supposed to be that I can do this?

Thank you for your time.

 

[Polare]

Yes, the intention for these skills is definitely that you can purchase one for every X purchases of Backstab or Proficiency.

One Disarm can be purchased for each purchase of Backstab or Proficiency.
One Stun Limb can be purchased for every three purchases of Backstab or Proficiency.

If you have three purchases of Proficiency, you can purchase up to three Disarms and one Stun Limb but no more until you purchase additional Proficiencies.

These guidelines continue for the other similar skills (Slay, Parry, Assassinate, Evade, etc.).

-Bryan Gregory
ARC