When the player character opens a door with enemies immediately visible, combat starts immediately with rolling initiative. The player can start combat prior to opening the door, but that wastes 25 AP on opening the door. But there's a way to open the door and force-start combat with full 50 AP.
- start combat
- open door
- move alongside the wall to break vision
- end combat (no aggro!)
- wait for start combat cooldown to expire
- start combat
- move back to the doorway
Ideally the enemies would aggro when opening the door, even if vision is broken immediately.