Its your job to discredit those who testify against you either by skillful cross examination of them or your credibility on your testimony to som eover fact pattern.
Odds are most employees are only marginal at knowing rules and employers are better at it or use hired guns.
Sounds like you may have made your point and the examiner smells the employers rat--you need to wait--and if you don't like the outcome, sort out your appeal options. Use hired gun next time!