I let my brother (6?) unsupervised for one minute and some much larger kid got on the other side jumped up and when they came back down my brothers face smashed

I let my brother (6?) unsupervised for one minute and some much larger kid got on the other side jumped up and when they came back down my brothers face smashed into the metal pipe handle bars splitting his lip wide open, he came right over streaming blood, I was 8, so I immediately went to find mom and dad who were doing champion hunting dog obedience qualifiers and I think I saw dad first who was actually showing the dog at the time and walked into the show area to get him. Immediately to the hospital. Pretty sure dad was non-plussed but also pouring blood.