College football and the Brandenburg Concerto

[Update: Reports are stating that police have identified the man in the picture and want to interview him, in part to find out how (and if) he caused the events in East Lansing.]

Students at Michigan State University celebrated their football team's Big Ten championship last weekend the way many sports fans do: Setting things on fire. Police responded to a large civil disturbance and reportedly responded to at least 57 fires throughout the city. In many cases, the favored object to burn was a couch.

So what, you ask? Well because of the guy pictured at right, who attended the Big 10 Championship game in Indianapolis sporting that sign. According to the East Lansing Police Department Facebook page, they are looking for information on his identity. And rewards of up to $20,000 are being offered for information on the overall disturbance.

So the obvious question: Could this guy be charged with anything for holding up that sign? Could any prosecution satisfy  Brandenburg v. Ohio and the requirement that the  lawless action in East Lansing be imminent and likely to arise from his holding up a sign from a football stadium in Indianapolis?