"You can lock my body but you can't lock my soul" a very popular saying on earth by revolutionists or freedom fighters and one that literarily applied to Seth though with a few word replacements.
"Edwin could lock his qi, but he couldn't lock his body".
No, on further thought this sentence didn't perfectly portray his situation seeing as his ability to call upon his ridiculous physical strength had been taken away.
A more better way to put it will be by saying,
"You can lock my qi and muscles, but you can't lock my organs".
Though it didn't roll off the tongue as smoothly as the original statement, it perfectly explained Seth's situation, and that was enough for him.
Dragon flame and dragon roar, these were Seth's two trump cards, and they had always been available to him right from the moment he had been locked up till now.
Creation is hard, cheer me up!