In my Deathwatch campaign, the Kill-Team has been tasked with assimilating with the humans on a hive world as a moral-boosting exercise for the humans that live there, along with being a display of Imperial strength, and hopefully a humanizing experience for the Astartes. The marines chosen for the mission were all vastly dysfunctional. One of my players is a Raven Guard Devastator, Davian Helios, who is such a master of stealth that his ability to hide under tables is legendary.
Halfway through the mission, after briefing and arming, the kill-team and their Inquisitor deep struck into the garden of a hive spire noble, planning to attend a garden party being held in their honor. The kill team split up to mingle. Our squad leader, Apothecary Reginald of the Scrub Lords chapter, went off into the woods with some of the adolescent nobles to find some of nature's herbs. Assault Brother Miccu of the Blood Angels started stalking through the basement of the manor, searching for victims to exsaguinate.
But we're not here to talk about them.
We're here to talk about Davian Helios.
Davian Helios, Master of Shadows, Nightmare Walker, Pyromaniac, managed to sneak under the kids' table with a natural 02. There he sat for hours in perfect stillness, with not a single child noticing his presence. When an assassination attempt on the noble patriarch surfaces in the form of a fusilier bearing a grenade belt, Helios leapt up, threw the table off of himself, revealing his terror-inducing skeletal power armor.
I had the kids make a test of Fear 1, with a Willpower Stat of 25. They rolled a 99.
While the kids flailed in terror being driven slowly mad, Helios engaged the bomber. A few grenade accidents later, Helios walks back over to the kids table, drenched in burning gore. I have them make another Fear Test, this time against Fear 2.
They roll 100.
I arbitrate the kids all get 1d5 Insanity Points (a roll of 5, no less) and state, similarly to how 10 Courruption points kill minor NPCs, 10 Insanity Points does the same. Helios then proceeds to brag about he literally scared the "half to death."
My question is this - should Helios receive insanity points from the stark terror he induced on those children, and the psychoses they will undoubtedly now have to grow up with?