Would you call a foul?

[Hawks Coach]

I think your example is exactly why this is so difficult, and why off-ball is treated differently than on-ball. In your situation, you also have to consider how long you can reasonably hold your whistle. Down screen low in the short corner area, then a flash to the paint, then wait to see if he gets ball and a whistle if he does? That's pretty late on an illegal screen whistle.

If it's early and the screener is really pushing limits, you might want to get the call in regardless to make it clear that you aren't going to watch that all night. In the 4th quarter, it should be clear that you need to call it.