How
If I read your message correctly, you mean to ask how they bring the price down, right?
They do it like this; there are 2 or more traders working together as a team or they might even work together as a trading company.
Some of these traders put small sell orders at gradually lower prices, and their team-mates buy the small orders at lower price.
Like this, these traders manipulate the price downwards. The ordercosts are so low they can be neglected. In fact they are moving their NLG back and forth from one of their Bittrex trading accounts to the other.
Their goal is luring miners and other traders to sell their NLG at the lower prices. The trading team buys these low-priced orders from other sellers too and stacks their NLG.
Once the trading-team has enough NLG, they will stop manipulating the price, and up the price goes. Then the team sells their NLG and makes a lot of profits.
You can see this happening by looking at the order sizes and prices; if there many small orders of i.e. up to 1000 NLG and many small decreasing price-steps,
then you can rest assured the above tactics are being played.
Big question is how to beat this? First of all, do not sell at the current price-level. Remember NLG went up to 1900 satoshi, and rest assured it will bypass that value in near future.
The less NLG the manipulating traders can buy, the sooner they will refrain from manipulating.
2nd option is to buy their small low priced orders, as that makes their NLG stack decline and that is the opposite of their goal.
Let's kick some :-)