Free blocking zone

[ajmc]

There can always be extreme or hyper technical evaluations of the language of, just about, any rule used to create hypothetical interpretations that generate questions about potential scenarios that NEVER happen.

ReffingRefs suggestion above, is straightforward, understandable, readily recognizable and applicable, logical, follows the basic intent of the rule, and makes sense in how it applies to the general situation it relates to (line blocking) and is likely the interpretation that is most generally accepted.