Ahem, actually the argument is very solid because although a fantasy world HAS fantastic elements the rest of it is usually realistic and all the same rules of physics apply to the inhabitants. They walk, eat and shit like real people. There is just something on top of that in Sapkowski's world. Don't mistake realism with reality. Realism here is meant as realism in the limitations and rules that apply to this very fantasy world.
You have certainly a right to act against physics if you want to do so on purpose for whatever reasons you might have though. That's a whole different story.
But the criticism sticks and is still valid that you indeed act against the lore and the physics and rules that apply to the Witcher world (and therefore against "realism"). You're even actually aware of that some people will hate that (like me) so it seems that you know the difference between realism in fantasy worlds and creative freedom very well.
@jantherocker
Yeah, let's just fuck all rules and phyics and whatever. Why sticking to everything that makes this world lifelike and immersive if there is just something that isn't there in our own world...
You guys argue like one deviation from reality means complete anarchy. It really doesn't. You argue against the very foundation of fantastic elemements in every medium here and there is no ground for such an argument.