Eye dominance comes in a variety of "flavors." Some people have a very strongly dominant eye. Others have a weaker dominance. In some, dominance shifts from one eye to the other, especially when fatigued.
Sometime weal dominance or shifting dominance can make it impossible for one to effectively shoot with both eyes open. In that case he'll have to fall back on "Plan B", closing one eye.
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"It is long been a principle of ours that one is no more armed because he has possession of a firearm than he is a musician because he owns a piano. There is no point in having a gun if you are not capable of using it skillfully." -- Jeff Cooper
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