I think he's shaking because life got real for him all of a sudden, his disingenuous "aw shucks I messed up and I'm sooo sorry and it wasn't my fault anyway" isn't working for him now as it probably did with his parents during his childhood, and he's had a brief taste of what life in a regular prison outside of the US might be like for him. Extradition is the best thing that could happen to him at this point.