These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Nightmare Fuel: If Shirou doesn't accompany Aris when she leaves the house on her route, a stranger returns to the house with Aris's decapitated head in hand, and then proceeds to do the same to Shirou.