I'm just trying to figure out what June was doing in the bedroom in terms of walking round the bed and then ending up by the main door. It might be she was just wondering aimlessly completely lost, mentally and physically. Or it might be she still had the presence of mind to try and take some practical action by seeking out the telephone normally in the main bedroom. When she realised this was missing she may have been heading down the hall to the upstairs phone.
I've often wondered what the arrangements were in terms of accommodating BW. I would not want people traipsing through my home to get to a home office. It seems the two were separated but if June was able to push a bolt over her side then potentially she had access to an upstairs phone.
If she was able to do the above she must have been aware NB and the perp were downstairs.
We will never know why she walked to Nevill's side of the bed. There are multiple possibilities including:
1) she went after the attacker who was struggling with her husband
2) she went to try to check her husband's injuries after the killer departed to go reload
3) she ran to her husband to be protected after the killer departed
4) after the killer and Nevill departed she went to seek out the phone but found it missing so turned around to go out the door but was too severely injured to make it
5) was in a daze and walking around the room incoherently before collapsing
So it could be something as inconsequential as just being disoriented, seeking a phone to call 999 or something more complex like the parents trying to fight Jeremy.
Jeremy may not even know why she walked around the bed he would only know if she did it while he was present and he would only be present if she tried to confront him because if he was present she would have to go through him to walk to the other side. The only reason to approach him would be to confront him. She did have a black eye so it is possible she tried to confront him and he punched her. While many assume Nevill somehow broke past him and fled and then he pursued Nevill, it is quite possible and in my view even more likely that Jeremy fled with Nevill pursing him. He could have simply decided to flee to go reload as soon as the gun was empty but it is also possible one or both parents tried to disarm him there and then and he fled to go reload because of such. I don't know what good it does wondering since we will never know the answer no matter how much we wonder. I spend my time trying to figure out things we have the ability to actually figure out.