What is the impact of the manner of the witness on the conclusions of the trial?

'The conclusions of the justice hearing the cause may depend, and frequently do depend, not only upon the words of the witness, but upon his manner. The words can be reproduced afterwards; the manner cannot. As was said in Young v. Witham, 75 Me. 536: 'When the testimony is conflicting, the judge has an opportunity to form an opinion of the credibility of witnesses not afforded to the full court. Often there are things passing before the eye of a trial judge that are not capable of being preserved in the record. A witness may appear badly on the stand and well in the record.''