When shooting from Vantage terrain at a target with Engage Order: * You gain Accurate 1 if the target is 2" lower, * Or Accurate 2 if it's 4" lower or more.
Operatives 2" lower with Conceal Order cannot use Light terrain for Cover. They are valid targets. However, the defender gets an improved cover save: they retain two normal cover saves or one critical save.
For Obscured checks, ignore Heavy terrain connected to the Vantage terrain the attacker or target is on. Here, the shooter stands on vantage terrain, so all parts of the stronghold are ignored for obscuring. Note that a different terrain can still make the target obscured.
The same obscured exception works when the target is on Vantage terrain. It can't be obscured by the same terrain feature. Note: The vantage floor the target stands on provides cover when shot from below (it's intervening). However, it doesn't provide cover when shot from the same elevation.
Here's a complete comparison. * Engage Order targets are Valid Target with an accuracy bonus. * Conceal Order targets In Cover from Light terrain become valid targets (with improved saves). * Conceal targets In Cover from Heavy terrain are not a valid target (since Vantage only negates Light terrain for Cover).
When shooting down on an enemy near the wall, consider two things: * If the enemy is Visible. Often, they will be too close to a tall wall to be seen at all from the shooter's head. * If the wall will be intervening 1" within the target when drawing the targeting lines. Remember, the control range is a 3D bubble of 1".