Just check out insider transactions and recent news about secondary offering that tells what happened about Z. In simple words, 'greedy'.
Shares Short (as of Sep 28, 2012)3: 7.23M
Short Ratio (as of Sep 28, 2012)3: 4.50
Short % of Float (as of Sep 28, 2012)3: 89.30%
Shares Short (prior month)3: 6.61M
1,804,660 is the latest # of dumps ...... what do they know that we don't??