There weren't many positives from Ireland at the breakdown against Wales, with Justin Tipuric winning the battle, and Ireland struggling at times.
But then Sean O'Brien came on, and in a moment showed the rest of the Ireland team a thing or two. When the rest of the team failed to clear Alun Wyn Jones out effectively, Eoin Reddan in particular was struggling to hold off the Lions second row.
Then this happened:
Have you been taking notes? Sean O'Brien doesn't have time for scrumhalves to struggle clearing someone out.
Picture credit: Stephen McCarthy / SPORTSFILE