Ok, say I want to sell 4000 BTC for at least $115. I can't do it in one big swoop, otherwise I'll just trigger a panic sell.
Instead, I wait for the buy bids to creep up and sell to them, while making sure I don't sell lower than $115.
Obviously it works as well for buying.
All I'm saying is that I've witnessed someone(s) cashing out slowly.
When I'll be cashing out then first step will PUMP the price.
How? Walls are closing in, it's less easy to manipulate (on the cheap).
Unless you wait for the mother of all consolidation triangle and try to make an upward breakout.