A sharp fall in Tesla’s share price is raising doubts that CEO Elon Musk will be able to go ahead with his $44 billion purchase of Twitter. Tesla fell by 12.2 percent on Tuesday, slashing $126 billion off the market value of the electric automaker. That drop cut the value of Musk’s Tesla stake by $21 billion, which, as Reuters noted, was exactly the same amount he has committed in equity to the Twitter buyout. One analyst said the possibility of Musk selling shares, and becoming distracted by the bid, was causing “a bear festival on the [Tesla] name.” Others said continued falls in Tesla’s share price could jeopardize his funding arrangements. On a bad day for tech stocks, Twitter shares also fell back to trade around 8 percent below Musk’s offer price of $54.20 a share—reflecting fears that the world’s richest man might walk away from the deal.