This is just reading the intraday chart, I see it rebounding to 1.4. Magic number on the daily chart is 50% of 1.9 (they trapped alot of buyers there during the recent run-up). Fib retracement to 50% of that price should shake most of them out...
Btw, I don't follow technicals like MA's. I couldn't care less if the SP is in bear territory. The important part is the price-volume action and patterns.
(DISCLAIMER: Above not a recommendation to buy/sell STXS. Info for your educational purposes only. Always consult with an investment professional before purchasing/selling a stock)