It's this bitwhy are people hung up about Mathilde killing over 500,000 orcs and saying she is going to feel bad about it ? she intellectually knows that orcs only have one reason for living and that is the fight , loot , pillage and burn , she has no reason what so ever to feel bad about killing them orcs don't have family or loved ones to morn them they spawn out of the ground like mushrooms and get to fighting , looting , pillaging and burning everything nearby .
it makes more sense that she is drained from casting a powerful spell and having the attention of several gods on her
The implication then is that she saw a very huge amount (if not all) of the faces of sapient beings, confirmed that yes this one Ork/snotling needs to die, and then turned every one of them into ash.Burning Shadows is selective in what it burns, and the criteria used can be incredibly vague or incredibly specific. The dominant theory is that the spell draws information from the caster's mind to differentiate targets from non-targets. Either something else is going on here or there's a significant flaw in that theory. Because for an instant that stretches into what feels like hours, you glimpse one greenskin after another for a fraction of a second each and mentally confirm that, yes, it is an enemy of the Dawi.
Orks or not, that's gonna severely tax a sane person mentally and emotionally.