last hour of trading 18/10/2011

I'm interested in why the last hour of trading today happened as it did. Why did it push into 10.5c and take a big chunk of them out? And that was in the last half hour. The entire day was fairly uneventful imo. So I don't see any pyschological reason for the push. If people were all fired up it was reasonable to expect a run at the start of the day imo and this wasn't the case. Was it a strategy by big players then? Set themselves at 10.5 and push at 10c. The 10c to 10.5c is a major position with prior increments only being .1c. I am very interested in what you of the forum think as this is a new situation to me. And pyschology of traders/manipulation by traders plays such a big part of the market.
Ptony1948