That's why I said when they arrived .
They had not been told shots had been fired - that was not mentioned at all.
And the interpretation of a few brief words is easy in retrospect is it not?
for all they knew they could have gone there to find Sheila threatening to shoot herself in front of her father . Or she could have had a "crazy" shouting, threatening moment and then put the gun down by the time they got there .
I always criticised them for not going in to save the twins because they did not know they were dead - but to be fair when they arrived a threat to the twins was not even implicated by those few snatched words. the Dickinson report is interesting in setting out the time frame and the lack of communication.