@Walter Hinteler,
Some legal information (my opinion, which, however, coincides with that of many real criminal experts)
In the case of the European arrest warrant, our local judicial authorities (here: the Schleswig-Holstein state's General Attorney) only check whether the formal requirements are fulfilled, whether the offence in question is also punishable in our country and whether the requested person would be charged with it. It is not examined whether the act is actually punishable under Spanish law. That will be decided by Spanish justice, unless it withdraws the warrant.
In our criminal code there is section 81, "High treason against the Federation". This is similar to the "Rebelión" under Spanish law. The German judicial authorities will compare the two paragraphs exactly. If they conclude it's the same thing, they'll extradite Puigdemont for that too.
However, Puigdemont never called for violence. In this case, Puigdemont could only likely to be tried in Spain for embezzlement of public funds.
The final outcome of the Prosecutor General's investigation will be "exciting" - and will certainly generate new protests and emonstrations, either here or in Spain. And in Catalonia.