Earlier, we mentioned the O.O.D.A loop has two caveats. If at any point something occurs that changes the situation drastically, the O.O.D.A loop restarts with the new change in the process.
You may have decided to simply leave a situation, but then someone assumes a fighting stance. At this point, your O.O.D.A loop resets. You observe the stance, orient towards the new threat and make a decision.
Maybe now you'll choose to draw a weapon, rather than leave, and act based on the new information. The loop may be interrupted, once, twice, fifty times, or not at all.
The general rule of thumb however falls back to distance, and personal space. The closer you are to someone, the more you will focus on that, and the less you will focus on the area around you.
In crowed spaces, people will be close enough to pull your attention away from something important. Remember, it all starts with observe ... so it's back to "observe everything".
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