Back to the original poster's question... You're playing a game of Infinity, it's the second turn and you notice that a model that has never had an order or an ARO is standing a half an inch outside of your deployment zone. it's entirely plausible that you're only noticing this fact because the other player started making moves toward that model and you were looking to see where they were going. It's the same sort of situation, you'd expect the same sort of corrections. Like any other sportsmanship question, make sure you know how sharp the other player expects the knives the knives to be.
The simplest way is to just not play for these “gotcha!”-moments. Instead work with your opponent, when you see a situation like this, say “I want to slice the pie, so only B can see me, please check your models sight lines for me?”. ‘Intent’ isn’t about allowing you to sloppily place a model in sight, and claim they’re not. Its about engaging with the other player to avoid discussions. And you can’t work with these ‘hypothetical’ model placements anyway, because once the moment has passed, the placement becomes very concrete. - it’s Schroedingers table top model; when you look at it, it exists in both the ‘intended’ and ‘real world’ placing, but when you look away, it suddenly only exists in the real world... :p
