When a complaint has been assigned to a hearings examiner for hearing, the powers and duties to be performed by the hearings examiner in connection with the proceeding, without abatement of the proceeding, may be assigned to another hearings examiner, provided no hearings examiner shall render a written decision to the commission unless that hearings examiner was present at all arguments and the presentations of evidence concerning those matters.
Haw. Code R. § 12-46-34