Shiba decided to stop thinking about other things and focus on the incoming test.
Given that he might have spent two hundred years on the previous one in normal circumstances, he wanted to obtain as much information as possible before starting the test.
He wanted to prevent being trapped for a thousand years or so in the next test due to some nasty trick, and the will of fragment seemed to be capable of speaking more than necessary if Shiba gave it a conversation.
Even if Shiba decided to trust Eini and Shire about the Holy War, he didn't want to make Eini wait so many years for him. He knew that she would wait, but he would feel too guilty.
"I must say that the tests were really great. I improved a lot on them. How did you manage to make them so efficient?"
Asking directly about the next tests was too risky, so Shiba decided to start speaking about the two that he had already cleared. Still, it was true that he improved a lot.