When Donna questions Justin about Bill’s recent peculiar behavior, they are mutually relived that Marcus isn’t the one involved with Amber. Donna and Marcus are stunned when Marcus defends Amber against their negative words about her. Bill is caught off-guard when Steffy confronts him and makes accusations regarding the interaction that she witnesses between him and Amber. As Bill professes his innocence in the situation, he gets the shock if a lifetime. (thetvdb.com)