Rooke's bike was featured in the recent issue of Robb Report Motorcycling. In the article it said that he ran it up to 120mph on the salt flats. Then shortly after that he took it to the drag strip and it ran 140 through the traps. That's hauling some serious ass. Maybe the salt was bad that day, or the hardtail didn't like the salt.
He may have had half the displacement of Sand's bike, but I bet power was similar, if not the KTM motor making more. Just a guess though.
Jeff