Nah, there isn't as much manipulation as people think. It is not that easy to manipulate a stock that is not very thinly traded. With a very thin traded stock one would have the ability to run a price in either direction and try and trigger stops, but that is dangerous and you would be taking a huge risk if it got a away from you.
He most likely has a sell order (looks like limit 3.14) and is just trying to get it filled. He is hiding is size (which is legal) because he doesnt want to crush the stock and would like to get a decent fill.
You can tell if this is a market short if the bids move out of the way and the offer follows down on the next up-tick.
There are bids piled at 3.13 and they are not getting hit. That order may be a short but you cant tell unless you see it step down on the next up-tick.
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