Compelling. I watched Alan talking about this to Steven Greer years ago in the CSETI witness testimony series. It changed my mind about the phenomena. He's a British Bobby and if he says it happened. I believe him.
It sounds like they were having engine/electric problems. After all he found it not in flight, next it wasn't being stealthy, and he was dragged. The interesting thing about this is everyday we go past hundreds of cars before we encounter one that is broken down on the road. So, if you apply that scale of every one in a couple hundred break down to UFO's, instead of cars. Then to could suggest that there are tons of UFO's we aren't seeing. Of course, these are all assumptions. And despite all this sounding reasonable, I still can't help but feel like I am wrong here.