Personally, I dont really trade stuff thats "in play" unless its one of my core stocks. I like to trade the other stocks in the same sector(s), I'll let all the other daytraders out there fight over the stock mentioned in briefing.com or the like 

Quote from FastandFurious:
I see those small but deadly shorties all the time, and I often wonder why they exist or why they are so deadly. I see in the openbook that they would begin with 20k, then grow bigger, then again 20k, then grow bigger again, until it gets printed all. For example, on JCP firday, it was downgraded and there was about 2000 shares keep stepping down, then showed 7500, then a full 10k, then it clears the .00s and repeat with 20k until it gets all printed.