not ducking when on same tack

this seems to be a very unusual and rare instance to turn Up to avoid. brought on by not taking maneuver action earlier. every circumstance is different and a "judgment call". The reason we'd recommend an immediate turn to port for Blue is because it would be turning away from Red. Trying to duck (going behind) is risky because you are turning towards Red and depending on your speed you could hit Red. A turn to port will allow Red to give room without any risk of collision.