Moses says no to God when God offers to make him into a new Abraham and instead chooses to stand in the breach between the Hebrew people and God.
And this Pharaoh, hell-bent on power, finally lets God's people go. His hunger for power had cost him everything, including his own son. The Hebrew people had finally been set free from 430 years of slavery, from 430 years of death and destruction and pain and life being stolen from them.
Moses was about to learn God's name and all of the Deliverance that comes with it.
Moses would meet God in the fire and understand that God’s very name Yahweh means the one who causes things to be.