As noted in the discussion of Mosiah 12:37, Abinadi has effectively accused Noah and his priests of blasphemy. He has accused the king and the priests of not teaching the law of Moses, the very law that they say they are teaching.
We do not necessarily know what the priests reaction was to Abinadi's statement, but king Noah was greatly offended and decides on the spot that Abinadi is guilty and should be taken away. He so commands.