At minimum just a violation, at maximum a TF I think.

Give the ball back to the offense. Not much of a penalty, so you don't see it called much -- but if the defense gets around a screen and disrupts the ball ...

That's what I was thinking. Not much of a penalty. so if your choices are leave a guy wide open cuz u got screened pretty good on the baseline, or go around the screen out-of-bounds, it's an easy decision. But, I like the no-call if it gives an advantage not intended by the rules.