Does heat exist everywhere? If so, what can we identify it by (traces, indicators)?
Briskness is a personal trait; that it doesn't increase the amount of heat you generate in the 'outland' means the outland is preventing this trait from showing up. What does briskness depend on location and not, say, other personal traits?
I don't know how they're affected. We should ask them.
Well, as a mechanic in MD, heat is gained, then lost, so not simultaneously.
Is it outright stopped? The way I see it, if you suddenly lose heat outside your homeland, it's not that your actions are not producing heat, but it serves as a reminder you're not home. It's not that one action generates heat and the exact same one doesn't anymore because of the location. They both generate same amount of heat, but there's a difference in...perception? You perceive the outside as ''outside'', dangerous, different, unordered and the drop in heat reflects the change of perspective.
This is the best explanation I can go by right now.
What separates the neutral land from non-neutral land is the involvement in the conflict. If we are not satisfied that heat is lost irrespective of this involvement, we can lower the numbers of heat lost for neutral lands. This boils down to whether you want to see the world in 'my home' vs 'everyone else' or 'my home' vs 'my enemy' vs 'people that can be swayed to one side or another'.