Sykes lost the engine.
It was comical watching Haslam tapping him of the right shoulder to tell him he was smoking badly as he passed at about 130 mph.
During Race 2 warm up, they spoke to Sykes. He said that the hose clamp came off the radiator, so it was steam and not smoke. He said he was bummed for if he would have made it back to the pits, he could of participated in the restart.
This was from the EuroSport coverage.