WATCH: Donncha O'Callaghan gets slapped after pulling opponent's hair

Early in the second half, O'Callaghan found himself irate at the dissolution of a ruck. In petulance, he grabbed a hold of Saia Fainga'a's dreadlocks, and gave them a yank.

Fainga'a slapped O'Callaghan across the face in anger, the force of which the Irishman possibly exaggerated. Watch the incident below.