“Yahweh rebuke you, Satan!” Since Yahweh alone knows the hearts of all humans and the reality behind every situation, He alone is in the position to make an accurate assessment of the situation and rightly rebuke Satan in accordance with what he deserves.
“Isn’t this man a burning stick plucked out of the fire?” In this vision, “Joshua,” the “man” represents all Israel, and Israel has been a stick that God has rescued from the flames. God had been rescuing Israel for centuries, and He had just rescued them from the Babylonian Captivity.
In this context, the image of a stick in the fire would have been appropriate for Babylon because the Babylonians did occasionally execute people by burning them (cp. Dan. 3:6).