Personally I like trading the breakout of a Flag pole however I prefer price retouching or pullback to the outer line of the flag pole and watch out for Price Action for possible price continuation something like exhaustion on a bullish or bearish candle that touched the line before pulling the trigger for a possible long or Short order with reference to the 1 hour or 2 hour timeframe definitely anot daily timeframe which I believe trading it breakout will lead to a massive drawdown if the price undergoes correction, however multi timeframe analysis is also very helpful to determine the trend of the market.
To this end I think scalpers may not have too much to do here with exhaustion, you are definitely waiting for correction and multi timeframe is useful to determine this position but I don't like to go for scalping because it is rather slow not to be caught up by retracement.. Although sometimes depending on the timeframe that this exhaustion is severe, it may change market direction especially with higher timeframe like daily above.