Stay out of my pond!

[mbyron]

If you're asking where the rules define 'incidental contact', you know of course that the rules don't define it. I assume that you're not asking for a dictionary definition. Do you use an alternative definition that's significantly different?

You also know that judging whether contact "significantly affects the play" is exactly what we're paid to do. It's a test we apply to borderline cases of contact to determine whether the contact constitutes a foul.

As for your case, if the screen were legal, then the question of whether the contact is incidental does not arise. By judging that the screen is legal, you've already answered the question of the legality of the contact.

I guess I don't see the problem.