The significant difference bet. price crashing down on low vol. and price crashing down on high vol.
Sometimes, certain things could only be visible on the chart when the share price starts its unusual / volatile movement (up or down all in a row, with or without volume). Bollinger bands are very powerful technical indicator. When using it as a key indicator, volume is not necessarily required, instead, the breakout (upside or downside) at the upper or lower Bollinger band is more important. Likewise, in a downtrend, volume is not required for a downside breakout at support level. However, in an uptrend, volume is necessary for an upside breakout at resistance level. Note: A price drop (or rise) on high volume all in a row is a stronger signal indicating that something in the stock has fundamentally changed.