Chook, I want you to imagine something.
Imagine that you are a huge trader and you want to buy thousands of Gold contracts.
Also imagine that the more you buy, the more you are going to push the price against yourself as other traders jump in when they see it going up.
Now imagine that you have a price infront of you to buy at but you want a better price (i.e. one lower) because you need to allow for the amount you are going to push it up by buying and also because everyone likes a bargain
Now imagine that there is a significant level on the charts that others are looking at. It could be a key support level, for example.
What would happen, if ALTHOUGH YOU WANT TO BE A BUYER, you started using your size to SELL INSTEAD. To push the market down so that you could attract other sellers.
You push it down through the support and in jump the other locals, novices, traders, that start selling, thinking its a breakout.
Then as the price tanks you can buy all you want off these other traders because it is all readily available to you. You can take not only all the ready supply without pushing the price up on yourself but you can get your bargain price
In the process, all the selling gets absorbed, the price quickly reverses and shorts begin to bail out or get stopped out...this then pushes the price higher and your profit begins...
This is one reason for a fakeout.