You have your facts wrong. There is no rape case - it's an alleged rape case. He's only wanted for a secondary questioning. There are no charges, so none can be dismissed. He's being extradited to Sweden for questioning only - at least that's the official story. They could easily do that in London as well.
Bringing charges works different in Sweden from in the US. In Sweden it is the starting point of the actual trial, and it relies on the secondary questioning having already taken place. There are no charges precisely because Assange's behavior is obstructing the phase where charges can be raised.
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You have your facts wrong. There is no rape case - it's an alleged rape case. He's only wanted for a secondary questioning. There are no charges, so none can be dismissed. He's being extradited to Sweden for questioning only - at least that's the official story. They could easily do that in London as well.
Bringing charges works different in Sweden from in the US. In Sweden it is the starting point of the actual trial, and it relies on the secondary questioning having already taken place. There are no charges precisely because Assange's behavior is obstructing the phase where charges can be raised.