Skyrim: Dragonborn DLC Miraak Bug

This is footage of the final boss battle of the Skyrim DLC Dragonborn. Miraak is suppose to exit this state of invincibility after sacrificing his first dragon. In this video he clearly does not exit this state. In no way am I saying that this DLC is bad, Skyrim is one of my favorite games. This DLC is great but it is DLC-breaking. This needs to be brought to Bethesda's attention so they can fix this bug.