By formally retaining counsel, he is setting up attorney client privilege for any discussions/plans.
At the local health center, it was advised that if ever an incident happened - some one fell on slippery floor, or anything that might involve malpractice charges.
Step one is to call an attorney and advise of the incident. Have the attorney write CEO a letter or send email instructing that they should perform an investigation.
That way anything found is protected by attorney client privilege. Otherwise the investigation would be subject to discovery for presentation in Court.