How would you explain ‘leave the grounds’ in the context?
The real name of Bull’s Eye is Billy Boorzai. He isn’t a regular student. He was, until his pop lost his job at a radio shop and his mam lost her marbles. Now he takes classes only half the day, then works in the kitchen and mops the lavs. At night he reads what he has swiped from teachers’ desks, getting his education on the lam, he says.
Bull’s Eye has admirers but no friends in here, he says, his friends are all on the outside. He gets to leave the grounds because of his job in the kitchen (the mess). The cooks send him to the butcher’s, the canvas man’s, even the gunsmith’s sometimes. He says the cooks need firearms for self-defense, the food is that bad.
How would you explain ‘leave the grounds’ in the second passage?