How much of not unloaded exteriors is still simulated when in an interior cell?

[NeinGaming]

I often noticed little things here and there, but this takes the cake: as usual, I was ignoring Preston and had gone into the Concord Speakeasy via the back door. I was busy looting, as Piper was suddenly shouting about something being "not her fight", and as I turn around I see Preston Garvey come in via the front door and crouch walk upstairs and into a room.

He proceeds to hide in the corner near the green trunk, holding his hand up briefly, then he grabs something (I'm not sure but I checked his inventory and he now had a 10mm and 1 10mm round), which apparently bolsters his courage so he confidently sticks his laser musket into the wall, as if watching for hostiles. After doing that for a while he decides that "it looks like we ran them off", tells me if I asked him, freedom is always worth fighting for. Then he runs back downstairs and promptly leaves via the back door.

I have a script on companions that takes away one ammo for every 50 shots fired, could be he ran out of ammo, and I have disabled combat boundaries on literally all encounter zones, I guess otherwise that would not have happened. But still, how?

One explanation that wouldn't require actors actually "doing stuff" outside while the player is inside might be that just before I got inside, he ran out of ammo, and for some reason decided the 10mm in the Speakeasy might be his best bet, and started pathing there when I was outside and just continued pathing when he was "off-screen", which we know actors are kinda good at. But Then how would he know about the 10mm before I was even inside?

edit: I just checked the footage, he had the 10mm but also fusion cells for his laser musket, so ammo wasn't the issue here.

Or is this related to cells not always being unloaded immediately when the memory isn't needed (like when entering a small interior)?

Before, I had notifications about people dying or killing just after me entering an interior... but this time I was in there for a few minutes, I was nearly done picking up all the small things, so I was really dumbstruck when he strolled in.

Any ideas?

Edited 14 hours ago by NeinGaming

[Qrsr]

Sounds like a script sequence part of the Sandbox he is using during the quest. Which when loaded proceeds when moving into the interior and vice versa.