SanDisk has just bounced to 912, close to the first target of 914 given this morning. It has rebounded 100 points. Even if it has bottomed and is recovering, it won't jump straight from 794 to 900. So shorting above 900 is safe and likely to be profitable. If it falls below 880 and then 850 again, you can add to your position moderately and follow the downtrend for a second test of 800.