Perhaps consider a total of "X" dollars in the market. Much of that was invested in the financials. Then the bad news keeps coming globally on the financials, including on our home front, and investors pull their funds out of the financials and pour them into resources. Obviously the SP of the resources rocket as this happens over now quite a sustained period.
Then, perhaps because of the attractive yield on especially the big banks, at the first faint glimmer of good news on the financial front, many investors think, whacko, it's all good again for the banks so the funds come out of resources and into the financials.
Doesn't really have to be more complicated than that, does it?