I wouldnt be shorting at these levels.For one it hasnt broken a new low,and also bounced off support yesterday.The performance of OST yesterday was due to BSL cap raising.Otherwise it may have put on at least 6%.So i do believe that some were selling to buy BSL on the cheap,or selling in fear that they would do the same.
AS a long term holder of OST i dont think they will follow.
gunn