Don't want to worry you, but I know you are a bright bloke and have probably started thinking as I have that druggie/chavs need money. There is money in child p**n, cameras are used to record child p**n, young children often see sex with adults as 'monsters'. Is he afraid of what happened in front of the camera? I'd talk to the local GP if I were you. They may decide to call in a child psychologist to see if anything untoward happened. Hopefully it didn't, but it's far more common than most of us are aware. Hope I'm wrong.