I just had another look at that DCG chart I posted, and I remembered I was going to include an explanation of the UpThrust, & the Hidden UpThrust in particular, as I included one the chart.
A normal Upthrust, is an Up Bar which shoots Up with an average to wide spread (in most cases, relative to the surrounding bars), but closes on it's lows, and can be on Low, Average or High volume.
The Hidden Upthrust is the same as a normal Upthrust, except that it closes as a Down Bar, not an Up Bar.
The Upthrust is most often a secondary indicator (meaning it wont normally stop a market on it's own, but would normally confirm a primary indicator, like a buying climax or an end of a rising market ect.), although just to confuse things a bit, It can sometimes be a primary indicator, for example if the Upthrust was on Ultra High Volume, but this is fairly uncommon.
Upthrusts can appear anywhere on a chart, but are most powerful with weakness in the background and/or in a down trend, when they appear with strength behind them, or in an up trend it may just mean the shareprice might go down to Test or move Sideways for a bar or two.
Lastly, you can also have a No Demand UpThrust, which is really just the same as a normal UpThrust, but it also qualifies as No Demand Bar.