Crashes coincide with increased volume, no?
If the lag does not exist on high volume moments when it is shooting going up, then maybe you have a point.
Have you ever seen an hour lag on an upswing? In 2 years, I haven't.
Prop up?
People are panicking and MtGox makes the selling more extreme.
How so? When they start slowing down peoples ability to sell off, the price drop loses momentum.