Huge shadow upward looks like some one build solid short position + on Poloniex you can see solid shadow downward. There is difference how these 2 shadows was build.
The upward move was made step by step and had a little consolidation above 3200. The downward move was rapid (1 order fast drop) and only on Poloniex.
By technical analysis you can see Triangle.
May see panic sell and as result test of previous low around 2100. Will see how it go.