MUMBAI - The non-stop bull run on Dalal Street came to a halt on Wednesday, as benchmark indices registered the biggest losses in a single session in over nine months after scaling record highs in early trade. From the all-time high level of 21,593 points, the Nifty 50 slumped more than 400 points or 1.4% and settled at 21,150. The Sensex plunged by over 1,400 points from its lifetime high.