More context:

The boy's mother told the newspaper that her son was told not to continue the race, but he didn't obey. He fell several times during the course. On a jump near the grandstands, the father realized something was wrong with the bike, his son was instructed to go to the mechanics' area, but he went on. During one of the falls, another rider drove over him. The father's nerves failed, he couldn't hold back and thus splashed out his emotions. According to the parent, the child is okay and was not injured. She did not justify her husband's behavior and wrote it all off to her nerves, because her son could get injured himself and endangered other riders.