I think the endpoint I'd be heading towards is Test Cait and Reeve just being the same person. Like, anything requiring focus, he has to drop whatever's going on in one body to deal with, but he can easily pick up coffee with Cait while holding a convo as Reeve, but anything serious is like when you need to shut up while driving or playing a game to lock in. One guy, two bodies, but still mostly human ability to focus. Human brains are really good at just sorta adapting to that sorta thing anyways? like how when you're good at driving a car you just know where the corners and tires are, you know where you loose grip, you know when something feels off, that sorta thing. Its not even really magic, that part, that's just normal ass human adaptability. The "Field" models all have basic AI to deal with most things so Reeve can just sorta no-brain and ignore it in combat, they're still 'him' but most of the time its a ghost of him, not really him-him? There an AI handling some of it, he gets alerts when something important is happening, there's a handoff when he takes over, the memory integration is a lil fuzzy but workable. He's technically in both places at once, but not really. So it would be odd to him as he's using Test Cait that things just seem to slowly get smoother. At first it would suck, just too much stimuli, total visual overload, audio confusion, likely migraines, nausea, disorientation. There no AI to do a hand off, but for whatever reason he needs to be in both places at once. But he keeps doing it and eventually he can pay attention halfways to what Cait's doing and what Reeve's doing. If someone talks to one, there's no lag for the other. And it gets easier the more he does it. He can be drawing plans in his office while walking and talking with someone. All with no AI to help manage it. I'm also just imagining the sensory hell when he tries to do that trick in the same room as himself the first time. Thinking it'll be as easy as having the AI and him in the same room. But no, where there's usually a light interface, there's just his brain getting raw stimulus from two bodies at once. Sound would absolutely wreck him, as what direction a sound is coming from gets confused, and vision wouldn't be much better - unlike a mirror you're seeing yourself from both vantages. This man is gonna be trying not to throw up on the floor.
