On the first time I saw it io thogught "Well nice humanization, very different from their orginal human form, but nice, anime-style humanization".

Then my second thought was something like: "Wait, what Scootaloo has on her leg?"

Then i realize this is a prosthesis... well maybe oryginal Scootaloo isn disabled, and Equestrian Scootaloo is maybe just to Young or something, but her lack of ability to fly could be considered as disability, so... well it fit quite well... and RainboowDash help her to break her limits... that... make their friendship even more awesome!