They already know where the clan is, but not the specific details as of yet. The men are not moving in to capture and/or exterminate them until they have a good picture of what they're up against, so what they're doing is capturing any stragglers and torturing them for information (numbers, presence of Dosu, etc.). The fact that the humans are resorting to war criminals (if done to other humans) level of torturing could possibly mean that they're out to eradicate the yukkuri in the area.
During the interrogations, the yukkuri would break down and call for "Miss Angel" to come and save them, raising the men's interest.
...Or that's how I understand post #33046 (as it looks similar to post #27050 and post #27050 to not be a coincidence). It's all speculation until we get translations here.
Hmm i just thought something, what if there is really no miss angel or anything? as in a mayor character being the "miss angel" but actually it's a typical "God save me!" kind of cry but since this are yukkuris they take it to the next level of being 100% sure the Angel will come and save them.
And as i commented on the other new page, i think this series has a "noirish war movie" feel, maybe the story is more about narrating this small conflict between humans and yukkuris and there won't be any special angel or anything, just humans doing a typical clean up operation but being represented in a noir like format.