Pondering on this, if you still around Paul, just so I got it right.
First shot with wife was the foundation or pattern for subsequent shots. Wife walked away and this did not print to the frame because there was no new light.
You walk forward with a torch switched off, so again, you dont print as no new light. You hide round corners and paint bits in with the torch. But each time you come out of a corner its not printing you because the torch is off and no new light. I suppose a dim light to see by wont print as its not adding anything to whats already there.
A bit like my way of having several torches and lamps an hiding them behind rocks etc to set my frame up. But Live Composite means you need only carry one torch and its a lot less aggro.
Have I got it right, well more or less?
My avatar is a poor likeness.