But what does the attack itself tell us? The boy - strangled, lying on the bed, covered by the futon (very little blood). The father, attacked on the head, but also, his pants cut on the legs and thighs. (It might indicate that he was coming down from the attic, although the police thinks that Mikio was more likely in the computer room, so, coming up?). The daughter and mother, viciously attacked in the head and face. The mother attacked savagely, but afterwards, it seems both the daughter's and the mother's faces were covered (perhaps the bodies, too.) The police thinks the murderer does it if the victims are known to him. One, however, might interpret it differently. The cruelty seems to mount with each murder, and the guy has slaughtered the house. When all are dead, the perp is left alone and helps himself to the food, naps, etc. He "lives" in the house for a while, and it is possible that he feels it unpleasant to view his "job". So he covers everyone - except for Mr. Miyazawa. For a certain reason, the perp is unfazed by Mikio's dead face. I can imagine that covering the body of a dead "enemy" and maybe, even crossing oneself is ritualistic. But when it comes to Mikio, the attitude changes to "whatever". Does it mean anything, or is it random?