This is one of those skills that has great utility in the real world, but is seldom discussed in flash-based entertainment rifle schools. Its birth came about after the April 4, 1991, in Sacramento, California. 41 people were taken hostage at a Good Guys! electronics store by four Cambodian Gang Members after botching a prior robbery. During the hostage crisis, three hostages, as well as three of the four hostage-takers, were killed. The fourth hostage-taker was captured by authorities, and an additional 14 hostages were injured during the crisis. To this day, the hostage crisis remains the largest hostage rescue operation in U.S. history, with over 40 hostages having been held at gunpoint.

The assault was a sniper initiated event but the glass at the front of the store deflected the path of the bullet. The training changed for snipers where two snipers fired in succession. The two snipers aligned on the same target. They coordinated their breathing and upon hearing the report of the first sniper's rifle, the second sniper fired. The objective was for the first sniper's bullet to strike and destroy the commercial glass, clearing the path for the second bullet which was one second behind.

In a broader context, it has application where there are multiple threats to be eliminated in the least time possible. As soon as a report os heard, they will be alerted so the coordianted fire of multiple snipers is useful to engage them simultaneously...or almost so.

Examine the image above. That is my son and I after a few dry runs for timing. See the fired cases in flight.