I believe it works as follows but I just can't remember exactly: -
Once the cascade skill reaches half the value of the parent skill you don't add the two different scores anymore. It's no longer a cascade but a skill in its own right. That is, once Rifle Skill equals half the value of Pistol Skill, you no longer cascade Rifle from Pistol but treat it separately.
So for example, if the Pistol score was 6 and Rifle with both the cascaded value and any additions was 2 there's no problem. Once the Rifle score equals 3 without any cascade additions, it becomes a skill in its own right and is no longer treated as a cascade.
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