Retaliation manifests itself in subtle, passive aggressive and/or overt ways. It can occur in one swift blow or over a prolonged period of time with a series of subtle, yet damaging, injuries. In addition to ultimate employment actions such as termination or demotion, retaliation includes “the entire spectrum of employment actions that are reasonably likely to adversely and materially affect an employee’s job performance or opportunity for advancement in his or her career.