No problem

The spell isn't entirely aesthetic. If you approach within 15 meters of Turoth without that spell on, you're going to get a really deadly DoT even to higher-level players. That buff makes you immune to it, which is why you can get it re-casted at any point in time during that step.

I don't see a huge problem with it allowing you to fly despite the hatchling look. It's only temporary, after all, but if any of the team finds it to be an issue (confusing new players comes to mind), it might be restricted in the future. For now, enjoy flying as a hatchling.