When Nexstar CEO Perry Sook opened an investor call on Thursday, he referred to the company’s merger situation with Tegna as “unusual.” That sounds like an understatement. The company’s hopes of becoming a broadcaster behemoth, with almost 260 stations covering 80% of the country, well above the current limit for a single owner, have been put on pause by an antitrust case in California. A legal challenge is also being mounted in D.C. over the way that the FCC gave the deal its blessing. While there ultimately could be some sort of resolution, wherein Nexstar agrees to more divestitures, the company is in the rather rare position of owning assets that it, under the terms of a court order, largely has to keep apart. What is unclear is a timeline, whether it will be weeks or even months before Nexstar can proceed or, in the alternative, has to drop its plans to merge or greatly alter them in the face of an adverse court ruling.…