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Why did Pharaoh not ask Moshe and Aharon to leave (as he did earlier, in 5:4)?
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Ramban (to 5:4): This time, when Moshe and Aharon responded to Pharaoh's request for a sign, by proving themselves (at least) on a par with his magicians, their esteem rose in his eyes, and he now considered them equal to his wise men. 1
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Ramban: Moreover, he feared the imminent Makos; and from the moment the Makos began, he became awestricken before Moshe and Aharon. See, however, verse 10:28.
