Good news = Bull interest = Bear/short interest as well. That's how they make money, actively traded stocks that are expected to go up on news. Impatient traders close positions quickly when they see unexpected or opposite price movements = money in short's pockets. Only way to avoid it is to snipe positions, in and out quick.. or wait it out until they cover and price recovers.
I don't know, but I'm hanging tough here with TSOI. I have a feeling that this is going to be a very good stock to own in the coming months. TSOI is very solid in my opinion. I have no problem continuing to wait it out.
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