Hmm so basically, the yukkuris were inside the house like coackroaches, anon kills one like one would kill a big, well moar like grab it like how one would pick the remains of a bug with paper and then crushes it, the Reimu leaves through the windowed door, the anon closes it in the same fashion you do that to flies?
At leasts that's what i'm getting of this comic and the translation.