Karate/karate-do + Ken-po Goku-i (yang + yin of martial systems) teaches us to use our body-mind to achieve something unique in our practice and life. A core teaching of both is the use of both "eyes and ears" to see and hear many things both literal and figurative as our minds interpret what is seen in scanning so we may act accordingly with out resorting to a somewhat ineffective, for our time, instinctive reaction to stimuli, etc.
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Using your imagination and training to rotate the head to the left and right provide your eyes, both direct and peripheral + hearing, a full three hundred eighty degree area coverage. If something is detected to the absolute rear by hearing an peripheral vision the body can turn ninety degrees either way to verify data before acting, if time permits.
Give this some serious consideration. After all, in my view, this scanning is actually the first physical training fundamental that provides the art of avoidance its best chance of success.