CFRA downgraded Tesla (TSLA) to sell with a $300 price target. CFRA's Garrett Nelson talks about the "red flags" he sees in the stock that he believes are sell-off warning signs. His firm points to Elon Musk's re-upped focus in the company as the driver for Tesla's recent rally that he says is "fully priced in," adding that valuations are far above CFRA's fair value. Tom White turns to the options front for Tesla.