That’s the CSI/BCA Pool League Rule (must always be called even if obvious).
Here is the WPA Rule:
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The rule says that the referee must be satisfied that the intended shot was made. In the example in this case I think the referee would be so satisfied.
To me the language about banks and combos uses “should” rather than “must” for a reason. This is also consistent with the ability of the ref to ask for clarification.
Yes, the safe course is for the shooter to call all banks, kisses or combos but I don’t think it’s required.
[mention]Bob Jewett [/mention] can correct me if I’m wrong.