Tech billionaire Elon Musk is offering a cheaper price for his takeover attempt on Twitter. A deal at a lower bid is “not out of the question,” Musk said in a video interview at a conference on Monday.

Twitter shares ended the day in US trading down a good eight percent at $37.38. That’s a far cry from the $54.20 per share that the head of electric car maker Tesla has so far promised Twitter shareholders.

Musk himself sent the stock plummeting over the weekend by declaring the deal to buy Twitter “temporarily on hold.” He first wants to wait for calculations to show that accounts without real users actually account for less than five percent. It is still unclear whether Musk can put his agreement with the Twitter board of directors on hold from a legal point of view.

“The more questions I ask, the more worried I become,” Musk said during his conference appearance. He estimated that fake profiles accounted for at least a fifth of all Twitter accounts – but gave no basis for this. Musk had declined an in-depth review of the Twitter books prior to the takeover deal.

Earlier, Twitter CEO Parag Agrawal attempted to explain the service’s methodology in estimating the number of spam and bot accounts in a series of tweets. He also wrote that such estimates are difficult to make from outside the company. Musk countered with a poo emoji and asked, among other things, whether Twitter had tried simply calling users with suspicious-looking accounts.

This idea was immediately ridiculed by experts. Twitter calls the figure of 229 million daily users that the service can reach with its advertising. The fake accounts identified by Twitter have already been deducted from this number.

Musk said at the conference that he believes a significantly higher proportion of bot accounts than reported would be serious misinformation. The agreement with Twitter provides that the sides can withdraw from the deal in the event of massive deviations.

However, it’s not clear whether grossly inaccurate Twitter account numbers would be accepted as sufficient grounds for a deal’s termination in a court case between Musk and Twitter. The agreement provides for a $1 billion penalty if either side breaches the deal.