Euthanasia is illegal, plain and simple. On the face of it, Greer has violated the law. Withdrawing the feeding tube may be legal but prohibiting any attempt to feed Terri naturally is making life ON ANY TERMS impossible. Death is ordered as the only possible outcome.
There's absolutely no excuse for not charging Greer with a violation of the law, arresting him and preventing Terri's death while Greer defends his position in criminal court.
What judge anywhere could override Greer's arrest?