Vanezis said there was blood staining on the PJ jacket. The burns were on Nevill's back, but they are a mystery to me.
I don't remember either seeing or reading about blood on the jacket but I do remember there being a broken button and a clean tear in it which was shaped like a small flap rather than a vicious rip.
He didn't have the jacket on during the shooting. If there was blood on it it would have got there by contact after he'd died.