Intraday - low volume/big bar

Can anyone enlighten me on this:

Typically there is a pretty strong relationship between
the length of a bar and the amount of volume to make it.

I am talking about the 5 min time frame here.

However, sometime you'll see bigtime volume and a puny little
bar or a little tiny scrap of volume and a relatively big price move.

The first case makes sense to me.
The second case does not. Is it a case where volume lags
price? wtf? Perhaps it means volume is so dry that smaller forces
can push price through manipulation?

Any ideas out there?

J
 
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