Keira, think about the telephone call Jeremy says he received.
Now if someone wanted him (Jeremy)at the WHF, they wouldn't tell Nevill to say "sister has gone crazy with gun". Just a simple, i need help Jeremy, sister fallen downstairs or something.
If Nevill was asked to say what he supposedly said, then the killer would be an absolute idiot, as police would be at WHF within minutes.
So 2 killers? Highly highly unlikely.
Shotgun warmed up as a torture weapon?? Using a lighter or lit cigarette would be easier.
NGB: I'd like to know if the silencer gets hot, so go for it.
And on the burn marks, if something hot is pressed into skin, it leaves a bigger burn as skin is wrapped around the hot object. Try pressing a blunt object into your skin, see how much skin comes into contact with the object.