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I believe what he's saying is he sets his camera to 1/250, F4.0 ish, and an ISO of around 400+ to start. He then takes a picture without any external light source(ie: ambient) and the camera will register a near dark screen. Not completely black but near dark. He then sets his strobes and snaps a shot and lets the strobes provide nearly all the exposure light. This prevents ghosting and stops the action very nicely and makes for some fantastic photos. Hopefully I got that right, but that's how I understood it and went to the high school gym and tried it. Once you dial it in using strobe power or a slight increase in ISO, etc.... nice exposures, stop action, and zero ghosting, with zero post processing.