He is a nut. Who says stuff like that? Think what you want, but keep your mouth shut. Initially and allegedly a victim, but his actions and statements changed the outcome for sure.
One thing that keeps wearing at me is why did that girl feel she needed to go down those stairs. Didn't hear the gunshots? She was with her accomplis while breaking in or so we are led to believe. How can you not hear a mini14 and a later a revolver going off? Did she think her partner fired the shots? There is no mention they were armed.
I am thinking there is much more to this story that we will never know because dead witnesses don't testify an an irrational person is left to tell the rest.