Chapter 20 is where Satan finally exits from his earthly history that started with Eve 66 chapters ago. He makes appearances at both ends of Christ's 1000 year earthly reign which Isaiah wrote of 700 yrs before Christ's birth and often appearing on Christmas cards (Isaiah 9:6-7) "For unto us a child is born, unto us a son is given and the government shall be upon his shoulder and his name shall be called Wonderful, Counselor, The mighty God, The everlasting Father, The Prince of Peace. Of the increase of his government and peace there shall be no end, upon the Throne of David." Satan knows scripture well enough to know what's coming. His illustrated features are assumed but his emotion is what I was after.