My guess, the same as always. Some warrant holders(having their safety net to depend on and, perhaps, have more information than we have with regards to news coming and when) who short when they think they can make a buck like they've been doing, are just playing the game. With all the good news this has to run sometime. After 7 or 8 years, I've gotten so old I can't remember, what's a few more months or more?