It's reasonable to expect that Musk might need to sell off some stock to cover the purchase. Though the amount of the sell-off is five times the amount of cash Musk will need to pony up.

It's also not unreasonable that Musk might sacrifice some attention to his car company, though it's unclear just how much magic he brings on a day-to-day basis.

Overreactions are not unusual in the stock market, especially in highly volatile ones.

Disclaimer: long TSLA