It looks like Wave C has farther down to go before it will be completed, possibly all the way to the 0.786 level, which corresponds with 1.618 of Wave A. Price fell below the lower trend boundary line, confirming the slide. There could be some support at the 0.618 level, but there isn't much historic data that there is anything significant going on at that level. Unfortunately Poloniex does not short ETC.