Are you sure about this? I'll go ahead and test it at some point but that's really interesting if so. So you could, for example, sedate a person, they could be seen by a distant NPC, and that NPC would then break line of sight to head toward the victim, who you then accident kill or stash the KO'd person. When they get there, there's no one to wake, so it's SA? Likewise if they see the person collapsed but have no way to path to them, it's also still SA?
Likewise -- and unfortunately I've looked for such an NPC to no avail -- a person who upon sedation happens to fall into water would die of an accident and even if someone sees them collapse (from drinking Sedative Poison presumably, since they can't see you injecting or it breaks SA a different way), no loss of SA?