It doesn't look like it says 'Shooting in kitchen' it looks more like 'Heating' but that wouldn't make sense?
Well they could be talking about heating to try to figure out what could have burned Nevill but since Mike took the photo from up in a tree I gave him the benefit of the doubt that closeup it actually says Shooting like he claims and that the S was faded so hard to see from the distance and the Os look distorted from a distance.
Clearly though any police documents referring shooting in the kitchen would be referring to Nevill being shot in the kitchen.