Screenie won't help, because what you see is the pit menu/background.
What he is saying is that BEHIND the background (i.e. not visible) the camera goes to spectate mode, and watches a car. If you use pitspotter or CSR (which works on the viewed car) it'll continue to do as the car your spectating (but can't see) is doing.
If he could post a fraps recording that might help, but I don't think it really matters. It strikes me as a fairly elegant way of keeping someone on a server, yet allowing them to pit. LFS wasn't designed to work 100% buglessly with CSR and that sort of thing.