Last year in So Dakota, while in deep catails, I swung on a rising phez, passing right to left. As I started to swing, I saw my friend in orange below the path of the bird and my gun's path. My friend was also swinging on the bird and I made eye contact with him before the bird passed between us. We both held our fire and I continued to swing on the bird to the left. I eventually fired and took the bird. But the orange caught my eye well ahead of the bird and alerted me to hold my fire. I would not likely have hit my friend even if I had shot when the bird was directly between us since it was above our line of sight to each other. But it would have been a big party foul and more to the point, a safety foul. Orange is very visible even to my color deficient eyes. BTW, many men have color blindness, or more commonly, color deficiencies like me that are mild and usually in a particular color spectrum, often green and red. Women are rarely color blind or deficient, explaining why they are always saying "oh, isn't that green field beautiful..."