the presumption is that you are selling less than you are buying as you trigger stop loses on the way down. Also you have no trading costs.
i.e. stack the sell side - so an extra 200k at each point 34c, 34.5c, 35c etc make it look like there are plenty of sellers, then drop 200k in one go and 2k every 2 minutes, then sit at the bottom and buy up 500k as everybody else panics. People see the stacked sell side (created by you) and then sell in the buying bid, rather than waiting on the sell side.
NEN Price at posting:
32.7¢ Sentiment: LT Buy Disclosure: Held