Why do you think he was climbing in and out windows in the first place Snow? When June and Neville went out they left a key in the coal shed, and for the earlier door he had a key. Why did he change which window he climbed through Snow, he’s been through them all.
If Bamber was practicing an entry and exit, he would have quickly learned that the kitchen window was the only one which could possibly be used to exit, HB! The sash windows would probably all have the same fixing, so if he couldn't secure one of them after he exited, that would be that! no need to try securing them all, surely?
No, if guilty we have to presume that not only did he decide to exit by the kitchen casement window, but that he had tampered with it in order to secure the side latch after he climbed out! Or did the latch just happen to be loose enough to secure with a bang?
And what about the bottom latch? just how did he manipulate 'it' onto its peg?
In one of the video's that Bubo posted, the CT say that Robert Boutflour suggested that JB secured the kitchen window after he exited by reaching in at the top fan light window! If so, how did JB then secure the fan light window?