When Cops Come Calling at 3 AM

So imagine this, yaar: my friend Rohan, a young college kid, is out partying late with friends at a friend's flat. The cops suddenly raid the flat, claiming some suspicious activity was reported by a neighbor. Rohan gets caught in a scuffle trying to defend his friend, and now the cops are charging him with obstructing public justice. But here's the thing - he had no prior knowledge of any wrongdoings, and he's never been in trouble with the law before. The police are demanding he come down to the station, and he's freaking out because he thinks it's going to ruin his student life. The cops are saying he has to come with them or face arrest. What legal remedy should Rohan apply here?