18.2 Giving Mark-Room
(b When the first yacht reaches the zone,
(i) if yachts are overlapped or bowsprit overlapped, the outside yacht at that moment shall thereafter give the inside yacht mark-room.
(ii) if yachts are not overlapped and not bowsprit overlapped, the yacht that has not reached the zone shall thereafter give mark-room.
(c If the yacht entitled to mark-room leaves the zone, the entitlement to mark-room ceases and 18.2 (b is applied again if required.
Mark-Room: Room for a yacht to sail her proper course to round or pass the mark.
Zone: The area around marks and obstructions within a distance of three hull lengths. A yacht is in the zone when any part of her hulls are in the zone.
The way I read this, mark-room and the right to sail 'proper course' persists until the inside yacht leaves the zone.
Spithill luffed (above Koreas 'proper course') long before they left the three boatlength zone:
What am I missing?
You are not missing anything. Thats what I have been saying all along. JS did not give the proper room at the mark rounding. Your video clearly shows this.
After they left the zone JS luffed and TK reacted appropriately. I saw no foul there.
So SW, watch the video. It doesnt lie. You are wearing the OR blinders as well it looks like.