Before docketing a complaint against an attorney filed by the attorney's client in a criminal proceeding, or filed by someone representing such client, Bar Counsel shall conduct a preliminary inquiry into the allegations of disciplinary violations. If a preliminary inquiry indicates a reasonable basis for opening an investigation based on misconduct by the attorney, Bar Counsel shall docket the matter, and shall thereafter follow the procedures of Chapter 2 of these Rules. After docketing the matter, Bar Counsel shall inform the attorney that the attorney is in an adversary posture with the client, and shall advise the attorney to move to withdraw from representation of the client.