As a trend nears its end, candlesticks will often be completely outside the Bollinger Band (free bars), signaling caution or a potential reversal.
"when the trend is you know starting to near the end you will also usually see uh candlesticks you can see for example these two candlesticks that are completely outside the band you can see the whole candles here are outside the band this by the way is what we call free bars so a free bar is when the whole Candlestick is outside the band and that basically means that the candles are way way above the norm and this is definitely a warning sign or at least a sign of caution if you are in this trade"