In my opinion this is a clear case where a team is using the rules as sword and deliberately set up yellow to draw a foul.

Yellow was reaching down to pass astern and when black did the fake tack yellow went back to close hauled (not tacking) to get on the hip of black after black completed their tack. When black went back to starboard close hauled (fake tack) yellow was still a half boat length away. In my opinion yellow still had time to crash tack but was surprised by the black move and tried to duck instead plus they clearly wanted the right and didn't want be controlled by black if they tacked to starboard. I'd really like to know if black was successful drawing the foul or not.