The Nifty 50 experienced pressure for a third consecutive session, closing down on December 29 ahead of monthly F&O expiry. The index fell below short-term moving averages and Bollinger Band midlines, with bearish momentum indicators like RSI and MACD suggesting short-term weakness. Experts note key support at the 50 EMA (25,830) and 25,726, with a break below potentially negating the higher high-higher low formation. Holding above this level could signal a move towards 26,300.