SB800 Repeat Flash

Has anyone used this feature and how did you use it.
According to the manual it is used for fast moving objects but I note the shutter speed needs to be relatively slow to be able to get multiple flashes in one frame. The two do not seem to go together.

According to the manual it is used for fast moving objects but I note the shutter speed needs to be relatively slow to be able to get multiple flashes in one frame. The two do not seem to go together.
