(ahhh you're misinterpretting his powers

and he's a rogue demon not a council one, he would gain power if feora got angrier, but not himself, you got it backwards XD Technically, Shin'ji doesn't feel his own emotion because he's constantly drawing them from others buut meh, ^^; [Plus he's not the type to imprision, unless he directly gains something from keeping them alive, then he keeps them close at all times, otherwise he just kills

])
Koro almost stumbled back from the voice, and then the images just added to his shock. But as soon as the pheonix stated she had to exact revenge he just snickered, lifting his cloak off the egg. "If in fact you are what you have just...well...shown, you are, then you have no need to worry about shin'ji, he was destroyed not so long ago". He spoke of it as though it was nothing, though the experience, and even now just the memories, were absolutely terrifying. "Shatter? That might kill it though?" he said, uncertain of the sanity of those actions. Plus if it could hold a pheonix inside it had to be pretty tough. And what to shatter it with, a sword wouldn't do, it would slice right through. They needed a club of some sort.
He turned towards Synya, feeling a little bad for pulling her, even though he was careful as he did it, "I take it you're okay?" he said, looking directly at her as he said it.