On the weekly chart price looks almost certain to end the week below the 200ma. If this does occur then a shorting opportunity may present itself (although we should wait one more trading day just to be certain).
On the there was a large reversal candle at the 200dma (1st July) since which price has continued it's move. A further gap down (on higher on 22nd October) gave yet more weight to a continued decline.
There could be resistance at the $28-$30 zone but, if you like to short in an overall bull market, DDD should be added to your watchlist.