Maybe it could be that Gilmour got sick of playing exactly the same arrangement in every single concert for 600+ shows running and threw in some random stuff to keep him occupied. Look at the boredom on his face. He carries on conversations with other band members while playing his solos. He stands there, endlessly regurgitating the same stuff over and over... give him a break! He's gotta mix it up or he'd go insane.

That being said, it still sounds terrible.

__________________
what do you teach your children about me?
what do you teach your little children about me?
pimp, thug, bling drug lord of the undergrounded kings
how can you be so sure i won't call down the rain?
what do you teach your little children about me?
you point your gun, wait, hide and run. i see it plain