Sort of, it's the same logic as any other well written fantasy/sci-fi/horror piece. A ruleset is established early on to ensure consistent story telling. We already know a Raven flies at a certain speed, as such, if you subtract the time it would have taken a Raven to reach Dragonstone, she then needs to fly at 600MPH to have reached them in the time shown.
It's the same as the ruleset for the white walkers, we know ordinary weapons generally have no effect but valaryian steel or dragonglass kills them. If suddenly a solider with a regular sword stabs and kills one (not beheads), it's jarring, it makes no sense and it breaks the established rules.