My favourite WoF quotes/bits:
"Terribly undignified," Qibli said in a haughty voice, tipping his snout at the racing dragons. "We would never allow such higgledy-piggledy shenanigans in the Ice Kingdom." "Was that supposed to be me?" Winter asked him. "Terribly unimpressive, if so. I haven't once said 'higgledy-piggledy' in my entire life. We would never allow such linguistic imprecision in the Ice Kingdom."
~
"The Nightwings are going to set their heads on fire," Qibli agreed. "No, wait. They're going to set the closest Icewings head on fire. Winter, I hope your skull is as thick as it looks."
~
That might apply if these dragons were my friends," Winter objected, "but they're actually strangers who happened to get thrown into a group with me. They're not even Icewings. Why should they care what happens to Hailstorm?" "They care what happens to you," Glory said. "For some reason," added Deathbringer. "Entertainment value," offered Qibli.
~
"The whole point of a top secret invisible guard," Deathbringer said severely, "is for them to be invisible and secret. Therefore it is extremely unhelpful for certain queens to go pointing them out and discussing them loudly with the entire rainforest."
~
"Winter, I believe that you're one of the best, bravest, truest dragons in Pyrrhia. I'll never be your enemy, no matter what you say. But go ahead and leave, if that's what you want."
~
Winter disliked it intensely when Qibli made clever observations like that, and it happened about forty times a day. 
~
Winter glanced over at Moon, for the nine thousandth time that day.