Citron Research, a firm known for its bearish calls on a variety of stocks, is getting bored of the little guys. This week, it's gone after a giant. Its report titled, "Has the Halo Been Broken on Intuitive Surgical?" has many Intuitive Surgical (NASDAQ: ISRG ) investors panicking. It's easy to see why. The report calls for a $350 price target "for now," and $250 over the next 18 months. In this video, Motley Fool health care bureau chief Brenton Flynn takes a longer look at Intuitive and its business to try and tease out the truth about whether it's really time to abandon your position in this stock or whether the company is stronger than Mr. Left thinks.