Rule 25. Disability of Judge

If by reason of absence from the district, death, sickness, or other disability, the judge before whom the defendant was tried is unable to perform the duties to be performed by the court after a verdict or finding, any other judge regularly sitting in or assigned to the court may perform those duties. If the substitute judge is satisfied that he cannot perform those duties because he did not preside at the trial, or for any other reason, he may, in his discretion, grant a new trial.