I've beaten the game today with no enemies killed and not detected bonuses on each level except the last two. It looks like no matter what I do, I indirectly kill a few stalkers in two sections:
In one section pulling a lever to open a door you need to progress also activates dart traps behind two stalkers overlooking said lever, killing them.
In another, stalkers seem to blunder into a spike trap even if I don't interact with the trap, or the stalkers themselves, in any way.
Did I get something wrong, does this make a complete pacifist run of the game impossible, or do I simply have to go out of my way to save those stalkers?
I forgot to take the screenshots of the sections I mean, unfortunately, but I can try to come back to get them.