Video Updated with more information. Thanks for the support so far.

Please view the on board video again. I've added more information to try to highlight the danger areas. Starting from the end of Lap 4 at the bottom of the hill you will see red or yellow squares appear for a second. When you see a yellow square that shows the approximate location of serious injuries caused by riders striking the walls. When you see a red square appear that shows the approximate location of fatal injuries from striking the walls. All preventable in the future if the walls are moved or removed.