question #1 Sahih al-Bukhari 3016, Book 56, Hadith 225 : What does this narration teach about the exclusive right of Allah to punish with fire?

Allah’s Messenger (ﷺ) sent us in a mission (i.e., an army-unit) and said, “If you find so-and-so and so-and-so,
burn both of them with fire.” When we intended to depart, Allah’s Messenger (ﷺ) said, “I have ordered you to
burn so-and-so and so-and-so, and it is none but Allah Who punishes with fire, so, if you find them,
kill them (i.e., don’t burn them).”