Fun With Expanding One's Primary ...

[Raymond]

This has nothing to do with expanding coverage. The Lead is not even looking at his primary. He is ball watching. He's on one side of the basket looking directly over to where the ball is. He's not looking at any other matchups.

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[Kansas Ref]

The T appeared to be totally occupied with the matchup right in front of her, as she can be seen administering an intermittent "5 sec closely guarded count" on the ball handler. Can she see in her periphery that an IS had occurred? Should she have been expected to be accountable?
I agree with the posters who have asserted that the L needed to expand/come off his monitored area, which he did judging by where his gaze seemed to be. Let us assume that he saw the IS, why would he not kill the play? I would presume that he did not want to appear to be "fishing in someone else's pond". But he was ball-watching.
Cameron I am enlightened by your comment " PCA is about one-ball coverage ".
JRut I am enlightened by your comment on " following players moving from your primary area"; this concept is consistent with what we do in following a dribbler from our primary area when they drive to the basket away from us.
BobJenk. I concur with your assertion that the T should've seen this IS ; an experienced ref should be able to "chew gum and walk simultaneously".
Raymond's point of placing responsibility on the L to come get that foul is certainly not beyond what should be expected from a mindfully-engaged ref.
Billy, thanks for posting that vid!

[Camron Rust]

Originally Posted by Raymond

This has nothing to do with expanding coverage. The Lead is not even looking at his primary. He is ball watching. He's on one side of the basket looking directly over to where the ball is. He's not looking at any other matchups.

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Can't disagree with that. But I know a lot of people that have had "stay in your primary" so beat into their heads that they don't dare go outside of it. In my training clinics for those wanting to work post-season, I try to impress upon them that primaries are first, not absolute, and second, mostly about on-ball coverage. It is easier to demonstrate the principle in a 2-person scenario and this play is a pretty good example of a play that demands the L both be looking off-ball and, at the same time, not limited to his "primary". I've bookmarked this video to incorporate into my training.