1. "I am Dragonbinder ... No mortal man should sound me and live ... Blood for fire, fire for blood." The instructions are branded on the horn itself. 2. Why do people always think only one dragon is going to be bound, and always think its Rhaegal? Is Viserion deaf? Vic's sample chapter shows he has 3 volunteers to blow the horn. One, two, three. In the 2nd Tyrion sample chapter, Tyrion can hear regular warhorns from where he is in the camps. I think everyone will clearly hear the sound "of a thousand wailing souls." 3. Any assault on Oldtown is going to be a disaster. The Hightowers know they're coming. Euron's infiltrators were caught, so they've lost the element of surprise. And the Ironborn are substantially weaker with the Iron Fleet (their most powerful ships) sent to Slaver's Bay. 4. Why would Euron have a Faceless Man steal a book from the citadel if he's going to attack Oldtown anyway, he could take it himself. Plus, the Faceless Men are assassins, not thieves. 5. Again, I think Moqorro is binding the horn to Daenerys. Vic won't get them either and will forced to make an alliance the normal way, with Dragonbinder as the ultimate bargaining chip. Overall, I have always thought Euron was highly overrated. That the fandom projects onto him. What makes him different from Dalton, Dagon or Balon? Dragonbinder, that's all! And that plan is going up in smoke. The dragons aren't coming. His men are going to die, he is going to lose the shields, and he is going to flee back to the Iron Islands with his tail between his legs in defeat just like every iron king before him. Then Asha is going to produce Theon, overrule the original Kingsmoot, run for queen again and win.