By Bret Kenwell Twitter stock is falling after Elon Musk tries to walk away from his proposed $44 billion deal. Here’s where it can trade now. Twitter (TWTR) – Get Twitter Inc. Report stock is down about 9% on Monday, and making new session lows in midday trading, as Tesla (TSLA) – Get Tesla Inc. Report Chief Executive Elon Musk tries to walk away from his proposed $44 billion deal for the microblogging platform. The situation is playing out as quintessential Musk, with the deal facing constant drama right from the get-go. Short-sellers — investors betting the stock price would drop — began …