Uriel can't mess with mortals' free will like that. As I said, he would be no better than Lasciel if he did.What he said must have been True.
He could. With seven words to neutralize Lasciel’s meddling. But even Uriel can not undo Lasciel’s meddling so he can only interfere with Harry’s free will in a different direction.
"When a lie is believed, it compromises the freedom of your will." (Uriel, Ghost Story chapter 50)Whose words would compromise the freedom of Harry's will if he believed them: Mab's, or Uriel's?
Isn't it said by Uriel that he is allowed 7 words to COUNTERBALANCE the words of the shadow. To me, that sounds like he can use any words he needs to use to fix the damage the lie did to the free will of the person.
“I’m saying many things,” Mother Summer said. “Do you have a chance to remain yourself despite the tendency of the mantle to mold your thoughts and desires? All Knights, Winter and Summer, have that chance. Most fail.” “But it’s possible,” I said. She looked up at me and her eyes were deeper than time. “Anything is possible.” “Ah,” I said, understanding. “We’re not really talking about me.” “We are,” she said serenely, turning her eyes away. “And we are not.”Butcher, Jim. Cold Days (The Dresden Files, Book 14) (p. 335). Penguin Publishing Group. Kindle Edition.
A lie is balanced by truth. What was taken from Harry was hope. What Uriel offers to Harry is that hope, the chance that he can remain who he is. Mother Summer will reinforce this when she takes Harry to the Outer Gates.
If you have free will you can fall even if Mab can't force the issue. You can change yourself.
Can mab lie to non-mortals? After all, demonreach is not a mortal.