In line with the previous post, SDS (the ultrashort S & P 500 ETF) could be a good option to play the short side. If you want something less volatile, use the SH ETF.
We do not have a buy confirmed, but it is recommended to include it in your watch-list, because it looks like it will reverse the trend, in line with the global markets.
But remember, this ETFs, are not for the long term. They tend to zero in the long term.
SDS / SPY ratio:
WannaCry Attackers Have Links To North Korea's Lazarus Group
46 minutes ago