A tactical technique I've seen used

[PRB]

http://www.maxvelocitytactical.com/2014/05/video-new-square-range-training-technique/?utm_source=feedburner&utm_medium=email&utm_campaign=Feed%3A+MaxVelocityTactical+%28Max+Ve locity+Tactical%29

[Pete]

A couple of guys were using that technique in a hotel hallway just a few weeks back.

Even had moving targets in between them.