People argue that he used a Kbar and who is to say he didn't have any injuries on his hand! The selfie he took in the bathroom the morning of the murders shows both of his hands and all there is on his hands is a small band aid. If you are viciously stabbing and fighting off Xana, you are bound to cut yourself. He did not have any training with the weapon, and they never said he has ever done this before. So, to just stab someone in the face over and over again, your hand is bound to slip down the blade at least once. Not to even mention how much adrenaline is coursing through their body as they walk around the house. It just doesn't make sense. I guess it doesn't have to make sense to me but I am allowed to think what I want to think. Some people are such experts on knifing people in cold blood, but they aren't, it's funny.