This comment reminded me of the days when Grey1 was around and ran his Technical Trader forum. I know DT was a member for a while and perhaps he will help me out here if I don't get this quite right. Broadly speaking, Grey1 used to advise members to assess whether or not prices are moving for technical reasons or for fundamental reasons (i.e. driven by news).
So, in cablemonster's scenario quoted, if the price move coincided with a terrorist attack on a pipeline or major oil installation, then some traders might (note emphasis please!) conclude that physical supply is indeed affected and that the subsequent price rise is for purely fundamental reasons. On an 'ordinary' day, i.e. there's no evidence to suggest any major changes to the physical supply or demand, then the trader might conclude that the subsequent price rise is for purely technical reasons. And by 'technical', I mean market participants speculating according to who knows what - phases of the moon, tea leaves or a breach of a resistance level or a 200 day moving average etc. As I think most of us are aware, DT lumps the whole lot together under the umbrella term 'casino'.
Those able to make the distinction as to whether prices are moving for technical or fundamental reasons are then able to adjust their game plan accordingly. A useful trick if you're able to pull it off on a consistent basis. Personally, I've never been any good at it. So, my solution is to ignore the whole lot and just try and figure out the prevailing sentiment on the day and then 'go with the flow'.
Tim.