"A European legal headache". That's how French newspaper Le Monde (in French, paywall) describes the detention and possible extradition of president Carles Puigdemont, currently being held in Neumünster, Germany. They note that Puigdemont's fate is the subject of debate in Germany, and that the topic is spreading to the United Kingdom and Belgium "where there are other pro-independence leaders subject to European Arrest Warrants".
Le Monde is clear that the case is complex because extradition is only possible if the crimes Puigdemont is accused of exist in German law, as is the case with the lesser charge of misuse of public funds. On the other hand, they question the charge of rebellion, which doesn't exist in German legislation, saying that the closest would be "high treason".
On the subject, German lawyer Nikolaos Gazeas tells the newspaper that for there to be high treason, there has to have been violence, which he doesn't see as having happened in Catalonia. The lawyer also emphasises that "the Schleswig-Holstein courts find themselves caught in an internal Spanish conflict which is political in nature".
Le Monde describes Gazeas, like other German legal scholars, as explaining that judges in Schleswig-Holstein, the state where Puigdemont was taken into custody which has to examine his case within 60 days of his arrest, cannot take the risk of exposing him to a political process in Spain.