In a world of magic, dragons, smart alecs in long coats, and mystery, what are you allowed to nitpick?
After all, it’s not like fantasy follows the rules of real life.
But the thing is, magic doesn’t automatically give a creator the right to play with physics. To make magic believable – and it has to be believable, to a certain extent, to be enjoyable – it has to follow rules. But more importantly, that which is unrelated to magic should still follow real life rules unless an in-universe reason not to is stated.
That’s not saying bending the laws of physics here and there is bad. But if something is obviously wrong, it will snap the audience out of a story. That’s just the way the mind works (or at least mine).
Fantasy doesn’t mean that no rules exist – just that those rules are different.
Photo found here