The Parable of the Weeds and the Parable of the Grins

This is like a strangely unclear translation here. In the niv, the angels will come and separate the wicked from the righteous and throw them into the blazing furnace. And it feels a little iguous as to which them is being thrown where. Why would, why would it not tell us? Like, how are we going to know what the good fish are and the bad fis?