Commanders subscribing to the "time" theory order "no offensive action" until all other options are exhausted. This is considered the "safe" resolution, and is why so many barricades last many hours or even days. SWAT teams working under these conditions are often labeled "Sit, Wait, And Talk."
Let's take a closer look at the element of time itself. There are times when time appears to speed up or slow down, depending on the situation or circumstances. However, time is always constant, marching to its steady, relentless beat every second of every day. Instead, it is our perception that appears to change the speed of time.
Experienced tacticians come to understand that time can work for or against both the good guys and the bad guys. No better example is found than with active shooters, who shoot and kill as many people as they can in the shortest amount of time.
With active shooters, and snipers before them, time is on the bad guys' side, not ours. With lives on the line, every second counts. This
lesson
about time wasn't fully learned until the deadly Columbine High School attack. Since Columbine, LE active shooter response throughout the U.S. and Canada is now immediate deployment to stop the deadly threat.
Yet, as successful as immediate deployment has proven against active shooters, many LE commanders remain reluctant to "take action" in other tactical operations. Preferring instead to wait…and wait…until what – luck or until it's too late?