1)
Was he not already prophesizing about the false Nevi'im?
1.
Radak: Now he will prophesize about the false Nevu'os.
2)
How do they prophesize from their hearts?
1.
Radak: They say that Ru'ach Hashem spoke to them. They tell the future ? this one will live, this one will die, this good or evil will come to him. They do witchcraft, and say that it is from prophecy.
