That's why I like to use and recommend shotgun/muzzle loader type scopes that have a longer eye relief of about 4-5 inches.
Some youth really can't be depended on to hold a rifle tight enough to prevent it from recoiling upward with some muzzle flip when firing heavier loads.
A while back, a youngster at a machine gun shoot in MA couldn't hold on to a micro UZI and the gun flipped up and around with his finger still on the trigger which shot him in the head right in front of his father and a crowd of people.
Someone (IIRC a 15 year old) who was overseeing the boy and standing right next to him couldn't grab the gun in time to save him.
A local police chief who was in charge of the public shoot was criminally charged and put on trial for inadequate supervision and/or negligence. Thankfully he was acquitted by the jury.
But as a result the laws have been changed in some of the New England states about the minimum age for shooting a machine gun. The boy's father and shoot organizers shouldn't have let such a young kid fire such a short barreled machine gun under the circumstances. Even if it wasn't a criminal act it was still poor judgement by everyone involved for trying to accommodate an 8 year old.