"and they shall take him out to the elders of his city and to the gate of his place": This is a mitzvah, (but not categorical).
"This, our son," who received stripes before you — whereby we are taught that if one of them died, he is not stoned.
(Ibid. 20) "And they shall say to the elders of his city": If one of them (either his father or his mother) had a severed hand, or were lame or mute of deaf or blind, he does not become a sorer umoreh, it being written "and they shall seize him" — and not if their hand were severed; "and they shall take him out" — and not if they were lame; "and they shall say" — and not if they were mute; "this, our son" — and not if they were blind;" "not heeding our voice" — and not if they were deaf, (in which case they could not hear his refusal to heed them.) They warn him before three (judges) and administer stripes. If he reverted to his wrong, he is judged by twenty-three, but he is not stoned unless there be among them the first three, it being written "This, our son," who received stripes before you — whereby we are taught that if one of them died, he is not stoned. "glutting and guzzling": glutting flesh and guzzling wine. Even though there is no proof for this, there is intimation of it in (Proverbs 23:20) "Do not be among the guzzlers of wine, among the glutters of flesh for themselves" and in (Ibid. 21) "For the guzzler and the glutter will be poor, and the slumberer will wear tatters."