A juror has no occasion for a writ to protect him. If a juror, or any other person, whose duty brings him to Court, whether as a party or a witness, is arrested while attending the Court, or eundo et redeundo, the Court, upon motion, will take order for his discharge. A writ of protection will not protect one who is not *254lawfully entitled to it, and is of no other use to one who is so entitled, but as prima facie evidence to the officer who is about to arrest him.