i think he is more meaning if the officer goes on a tangent
eg I was stopped coming home from Melbourne literally around the corner from my for an "RBT" at around midnight. It wasnt HWP though, I think he was a detective, had a different uniform, non-HWP unmarked police car, didnt really seem to know what he was doing.
He ended up asking where I was from (around the corner was my actual answer lol), where I had been, why was I driving so late at night, why had I gone to Melbourne, was it my car, looked inside my car in all the windows, was commenting about my camera gear on the back seat (I had been down looking at an S14 to buy so I took photos)
All a bit excessive for an "RBT". Im guessing he had been investigating a crime nearby, saw me drive past when he was on his way back to the station, followed me to almost my door step. I was too tired to give a fark but probably would have ripped into him if he had gone any further as it was late and I was tired and just wanted to get to bed.
What I think Braden means is if something like that happens, do you legally have to do anything other than provide your license and blow in the machine