At the end of this post will be a thumbnail link to one of the articles about the break-in at JBean's family home. I've blacked out all the personal names other than the Percys and investigators.
Over the years I've been keeping up with this case, I've seen much speculation about the reason for the large number of wounds from the attack. It's usually put down to the killer having some sort of personal anger at Valerie. While doing the cleanup and blacking out of the article below, I thought of another possible reason.
First, some background from the article.
In addition to the break-ins at the Percy and JBean homes, there were also another break-in at the house next door to Jbean's and an attempted break-in at the house across the road.
So, before the break-in at the Percys, this was how his record stood.
His 1st attempted break-in wasn't successful.
His 2nd break-in ended with the him being scared off by the private patrol.
His 3rd break-in was disrupted by Jbean's father waking up and hearing him.
Just to be clear, I'm entering into speculation from this point.
First, I think the Percy break-in was intended to be a rape or rape & murder.
The killer breaks in and goes up to Valerie's room. He's carrying his flashlight and trench knife. I think he was using a flashlight with a shoulder strap, so he had both hands free. Entering Valerie's room, he goes quickly to her side of the beds, clamps a hand over her mouth to keep her from screaming. He holds the knife either to her throat or in front of her face. Possibly he tells her to keep quiet and she won't get hurt.
Now remember, at this point, he's had 3 break-ins in a row go wrong. Here we are on number 4 and he's got his victim in bed at knife point, no other family/household members awake, dog hasn't barked. Everything seems to going as he wants. He's expecting her to be quiescent. Then what happens?
Valerie doesn't just lie there and let herself be assaulted. She strikes out with her hands and legs. Hard enough to leave marks from her efforts. She hits him in the mouth.
At this point he snaps. Here's his 4th break-in going wrong as well. He becomes enraged and beats her in the head, then switches to stabbing her. Over and over. Then he plays the light over her body, to see what the effects of his attack are. Valerie's moan has brought Loraine to the bedroom door. We know what happens from here on.
Anyway, that's my idea. He wasn't that angry at Valerie personally, but the combination of frustration of having yet another break-in go wrong and Valerie striking him painfully caused him to lose it and go into a brief frenzy.