"I know you did everything that's humanly possible."

It's bad here, but Kell is sure it's a lot worse on the other side. The awareness of this fills him with ire that's nothing like his usual anger. Not hot rage that's good fuel for action, just the chill that festers, seeping away his strength, eating away at him.

Kell had seen the suffering, the dying and the desperate. He'd seen the hungry of White London, the grim slums of Grey London. But Rhy? Radiant prince Rhy, who'd throw the most exquisite parties to entertain his people? Who would go out of his way to make everyone happy? He'd never had to see such things first hand. He might have been aware of them happening, but the knowledge of a thing existing and experiencing it yourself are like night and day.
It's one thing to know people die in wars and skirmishes, and a completely another to have a child die in your arms from wounds she would not have sustained if not for some sick idiot's ambition.

Kell would rip his heart out if it only helped Rhy feel better. If it meant Rhy could be spared this anguish. But it won't. There's nothing Kell can do other than sit with him.