Is this not what rule 15 states, "If the throw-in is not taken correctly it is retaken by the opposing team."
Read more at http://www.thefa.com/football-rules-governance/laws/football-11-11/law-15---the-throw-in.aspx#Ed3MFhSmXagTsPy2.99
The throw in was not taken correctly (not taken at all) so the Ref then awarded the throw in to Frimley for time wasting, then the Reds player was sent off for knocking the ball away hence delaying the Frimley throw in.