Well, to start with, presumably, if they were both there, each was a witness to the others acts. If there are other actors involved they could be witnesses to those other actors actions.
Yes, a no contact order can be issued against married parties ordering them to have no contact with each other.
Most places I have seen issue a no contact order upon the defendant being bailed out of jail. It could be issued when the person is formally charged. They are generally given rules (conditions) they must folllow when they are released (as opposed to being jailed) .