Yeah, unfortunately there's no "Don't sell on downward spiral due to market manipulation" specification on the order. Didn't mean to be crass, but this stuff is binary when it goes to the order system. Touchy feely stuff like this---don't create the order.
By the way, do you want to sell if news is bad, or do you have scratch to double down? Find other ways to mitigate risk by having a plan, and stop using emotions. My .02.