Price makes progressively higher highs (24905→24958), but volume is declining on each push (7200→3200). Buyers are drying up — the move is running on fumes. Watch how candle bodies shrink from 25pt marubozus down to 2-3pt dojis. When the last exhausted push happens on minimal volume, sellers step in and the reversal is sharp with 22-25pt bearish candles. (On a footprint chart this same idea becomes DELTA divergence — new highs on falling net aggressive buying. Plain candles can't show delta, so declining volume + shrinking bodies is the readable proxy.)
Order flow is the study of actual buy and sell orders being executed in the market. While price charts show you WHAT happened, order flow shows you WHO did it and HOW — the intent behind the moves.