Most of it was unsettling, and some parts were things he couldn't comprehend at the moment. However, he was glad to hear such, because he expected worse —being burned alive or being crucified with hot whips lashing at him from time to time till. He is someone with a negative mindset and the misfortunes seemed like a blessing.
Also...
'Derniere wants me to change the future. Why would he suggest about me using my Tama to steal other people's Tama?'
Shinji didn't know whether that was a good thing or not. If he acts according to the plot of the prophecy, he is going to suffer, not just once, but a lot.
However....
'What if Akane-chan told Derniere so that he would tell me in attempt to change the future?'
Shinji couldn't shake the thought from the back of his mind. It was clutching him like it's begging for a hug. Also, changing the future is a risky thing to do.
It's bad, but it might turn worse than what he thinks.
