The Sensex and Nifty opened flat on October 25 but quickly dipped into negative territory amid lacklustre earnings and ongoing foreign outflows. IndusInd Bank was the worst performer on Nifty 50, plunging 18 percent after its Q2FY25 net profit dropped 40 percent year-on-year to Rs 1,331 crore, missing estimates due to a sharp rise in loan loss provisions.