Every earlier plague, Pharaoh's court magicians had something to say. They turned their rods to serpents. They conjured frogs. They strained against lice and failed. But when the sixth plague fell, they could not even stand in the same room as Moses.
The Targum Pseudo-Jonathan on Exodus 9:11, the Aramaic paraphrase preserved under the name of Yonatan ben Uzziel, records it plainly: "The astrologers could not stand before Mosheh, on account of the boil; for the plague of the boil was upon the astrologers, and upon all the Mizraee."
The Targumist uses a pointed word — ashfaya, astrologers, the sages of Egypt who read the stars and claimed to bend nature. They could not enter the royal audience chamber. Their bodies were the evidence. The men who claimed to interpret the heavens were now disfigured by what the heavens had sent.
The Maggid teaches: when falsehood and truth meet in the same room, falsehood cannot hold its posture. Pharaoh's wise men were not killed. They were simply removed from the conversation. The boil was God's way of saying: this debate is over. You have nothing more to offer.
And from that moment, Pharaoh faced Moses alone.