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It is not a crime to violate an employee handbook or policy. You can't be charged with a crime based on the provisions of the handbook. Is the policy considered a substitute for a 30.06 sign or something? Self-defense overrides that usually, and defense of others might.

Unless there is a definition in the statute, or an appellate case interpreting it,I would think it is used in the ordinary meaning of the term, "without delay, at once; instantly, without any intervening time or space."

The common sense use is that the situation is such that you must act now to avoid harm that will happen if you do not act.