A sorcerer who performs a deed is liable, but not one who creates illusions. R’ Akiva says in the name of R’ Yehoshua: Two [people may] gather cucumbers —- one [of them] gathers [and] is exempt while [the other] one gathers [and] is liable. The one who performs a deed is liable; the one who creates an illusion is exempt.

A ben sorer u’moreh —- when does he become a ben sorer u’moreh? From when he produces two hairs until his beard grows around —- the lower, not the upper; but the Sages employed delicate terminology —- as it is written: If a man shall have a son —- a son and not a daughter; a son and not a man. A minor is exempt because he has not entered the realm of commandments.