Isaiah 7-9 "Immanuel's Dual Fulfillment"

In lesson 3 of Book By Book's study of Isaiah, we look at chapters 7-9 to see how the boys (Shear-Jashub, Maher Shalal Hash Baez, and the Child) bring out the purpose of Isaiah's prophecies. There is a typo at approx the 12 minute mark. An image says Syria was destroyed in 722 when it was Samaria.