This crashing of Brent crude makes sense if referencing Tom Luongo's piece. Although I am not sure if this is the black swan we have been waiting for. It could be ...
In my worm's eye view it looks like Saudis are declaring war on US frackers. Probably a logical outcome since Russians have said Nyet to Saudis on holding the price up by turning off the tap.
I can only assume that Tom has his facts right and that Russians can go down to $20 pb and Saudis need much more for their economy.