Round 8 Quintana is hit close to the back of the head and complains. Berto throws the same punch in the same spot about thirty seconds later and Quintana is buzzed and complains again while backpedaling across the ring. Berto picks up his output, a punching machine now. Several right hands snap Quintana's head back. Quintana is able to hold on, grab, and elude. The ref steps in after a particularly hard right hand while Quintana is still on his feet but cornered on the ropes.