If Ackman want to cover at 50% profit, then he had to scare and give some number in the rang of 0-5. So, he can pick around 50% drop. I believe he covered at least 50% by now.
Sentiment: Strong Buy
Ackman is brilliant. He didn't short this stock without first doing an enormous amount of analysis.
People buying at or above 30 are certainly playing into his hands. GLTA. You'll see a huge crash in this stock soon, just like Taser did years ago.