Great video and great rules discussion, to me it looked like there was a chance of contact once the Hobie 16 gybed in front of the other boats, this was avoided when the F16 went around it but it looks like if that wave had caught the F16 a few seconds earlier it would probably have surfed the F16 over the back of the Hobie 16. To me it looks like the Hobie 16's bow swung past the proper course at 45 seconds, if he sailed that line he would have been above the mark, then went even further above the line to the mark a couple of seconds later causing the collision. Isn't the main rule to avoid collision, the other rule not above proper course, if so wasn't that the cause of contact the Hobie losing control. It also looks to me that the Hobie 16 also had no rights against the F16 rounding the mark as it was in the zone after the F16 so was barging