4 right of way race rules
The rules are designed to prevent collisions, at all times collision should be avoided.
Rarely there is anything said in this case. The boat on the run generally can see the boat who is beating up. The boat beating up is shouting at the wind and unlikely to be heard.
Shout out Starboard!
Shout “Starboard boat”
Shout Luff up! but steer a proper course.