In addition, I think the interpreation is to keep from having such a huge impact on penalty like DPI (15 yds and auto 1st) on somehting completely away from the pass. PI by definition is interfereing with a players attempt to move towards or catch a pass (not a direct quote). Therefore PI doesn't fit that definition if action in question is away from the pass.
However, you can still have a hold or other illegal contact away from the pass.
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