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.
YMMV: Buffy The Vampire Slayer S 2 E 14 Innocence
Fridge Logic: So, no part of a explosive rocket or bazooka is manufactured through "heating and hammering"? Television Without Pity takes their word for it.
I don't think it's the "forged" that's the important part—it's more like "no weapon YET forged can kill him." That's why Buffy says "that was then—this is now." Times have changed.