There is another big lesson being taught here. He sits alone on the vehicle holding a large and very sharp knife under his own control, out of immediate reach of dad.
The unspoken lesson: I trust you. You are responsible enough to do this, a lesson that so many kids today never get the chance to learn. My dad did the same with me, turning me loose with my own knife at age 4, and a single shot 12 gauge shotgun at age 8 (I was a very big kid and could handle the recoil.) I never got in trouble with either one.
Congratulations to you and the lucky young man.