I am going back to something Rich mentioned
Another instance where I see double whistles is when a player drives the lane. While this is the lead's primary area, the trail may have a better angle on contact out front -- especially if the drive starts from the trail's side of the court. Since most of the off-ball activity is going to be in that area anyway, the trail's eyes are there.
I do not think this is leads primary here.
If the drive starts in trail's primary, there is no way lead knows what happens. This is especially true if the lead is working off ball right, lead may only pick up part of the play.... This is trail's call first. Then leads. If it starts below FT line then there could be a double whistle but if is starts wide or high it's trail's call.
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