The interrogation was not successful.
Aside from the three wanting to commit suicide in every instance, they were also very stubborn and doesn't say anything of value.
In the end, Miguel decided to forfeit their life as he no longer had any use for them.
Looking at the logs in the grimoire, Migue shook his head as he realized that they only gained a small amount of experience points from these battles.
The main reason was due to their level much higher than the Dark Snake Assassin group members.
Due to the level of oppression and difference, they only received normal evaluation, lowering the experience points they received even further.
Anyway, these were better than nothing so Miguel did not take it to mind. He had no expectation that he would gain a huge amount of experience points in these expedition anyway.