Again, this market is too small for this not to happen pretty regularly. People like to say, "You can mostly ignore market depth", but the fact is that most people do not ignore market depth, and the fact that most people don't ignore it, compels people playing in the market to react based on depth changes, which compels other people to react. This is not going to change until there are many, many more big players than there are right now.
I don't know how many times I've said that to people. This isn't the stock market!
The manipulator speaks. He clearly has access to the bitcoins to put up a huge wall.