JB didn't say he hung up. He said the line went dead so he then attempted to reconnect with his father and the line was engaged.
I know I am being pedantic. But the phone call is an important part of the investigation.imo
Land lines in 1984 would have details of calls in the billing statement.
It seems a bit far fetched for a phone call to be abruptly ended from JB's side with no explanation, It would have had to be hung up if, when redialing the other phone, it means the person was still on a call- hence the engaged tone.
IF we are to believe that NB hung up- then the line would not be engaged when JB 'tried ' to call back for more details?
... how much more details would you need if someone calls you to say someone has gone nuts -has the gun?
I doubt very much that NB would call his son if he was terrified for his and his family's safety. He would have dialed police directly on 999. Why waste a phone call to son? what was he expected to do anyway?
I stand by my claim there was no phone call from NB to JB.