They should be switching on all screens.
The problem wasn't the screen Lawson didnt even use it. Evans should have been up on him more. The screen was set between the 3pt line and the top of the circle. Lawson was 5 feet above the 3pt line. There was no reason for Evans to run into the screen in the first place. Then to compound it he got through the screen and proceeded to studder step letting Lawson get off a clean shot.