They are not mutually exclusive. In this case Ross could be a domestic terrorist based on the USC, if not for a castrated Blivens and the DHS trying to use the Supremacy Clause.

This as opposes to the administration saying Good was a domestic terrorist, when by definition she only fits section A and B if you stretch the definition by saying she was going to hit Ross and others in an assassination attempt… Which is difficult as she backed up from him and turned the wheels away from him, and further he put her in jeopardy by standing in from of the car which agents are trained not to do to civilians.

So yes, it could be considered a reign of terror as well, but that is more of a cultural definition, not a legal one.