Interesting question. First of all I assume the individual is armed and capable of inflicting harm. Despite metal detectors and searches we all know it's not a perfect system. Every human being has the capacity to inflict bodily harm. So I would start from there.
If we always wait on the authorities we will witness violent crimes being committed. By all means LE should be summoned but I would likely approach the guy trying to talk in a measured tone but on high alert. If no one is in danger, in the vicinity, I would stay back and watch from a safe area providing cover until LE arrived.
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