His name was Luis and he was being tutored by a boy at one table while he was simultaneously tutoring a girl at another table. I asked him why he was doing both at once, and he replied in Spanish (my translation): “Tutoring, without doing anything else, you lose a lot of time. So when she starts investigating her work on her own, I can advance along a problem that someone else is tutoring me in.”

His response was pretty shocking. 

Sara Vogel: Where Do Independent Learners Come From? In Mexico, Teachers Experience Them to Foster Them.