Why does the Torah not detail the miracle of Avraham in the Kivshan Haaish [the burning furnace]?

Ramban---explains that there were two types of miracles here. A public miracle when Avrohom came out of the furnace alive and a hidden miracle when he was expelled from Ur Kasdim and not killed. He answers that if the Torah would recite the whole story, then it would have to include what the people of Ur Kasdim thought of it. They thought that Avraham used witchcraft and apparently he had no proof against that claim. The issue of witchcraft was only cleared up later by Moshe with the plagues, where witchcraft was totally discredited. The Torah did not want to bring up those issues so the miracle was not mentioned. The hidden miracle, that he was just expelled from the country rather then killed, is treated as all hidden miracles in the Torah with just a reference to it with the word ‘hotzeisicha’, referring to the fact that Hashem saved him.