No worries. These are momentum traders who look for stocks they can short. A prime target of theirs is the stock that has nice one or two day gain. There is typically a pull back so they prey on the fears of those who can't stomach the pull back and sell to lock in their gains.
If you beleive the story, and there is no evidence presented that changes SIMG's future prospects, then you need to hold on to your shares or buy more. This stock is going to go a lot higher. Sooner than most think!