Did Bamber bring his own hacksaw to WHF, to get in through the bathroom window. Or did he luckily find it by the bathroom window.
It is strange that Bamber said he just needed a penknife to get in through numerous windows, yet claims he used a hacksaw after the massacre.
I suspect the hacksaw was used pre massacre to ensure a quiet entry on the night. He didn't need to do the same on the kitchen window, as he was exiting from there after everyone had died. So no reason to be quiet.