Fenrir mount fly?

[LadyVal]

I've questioned it once or twice and I'm still not a fan of it. Especially since it's not explained whatsoever.

It's Japanese fan service of Gamera, similar to Godzilla.

Gamera also has the ability to fly. Generally, Gamera pulls in his arms, legs, head, and tail into his shell, fires flames out of his arm and leg cavities and spins around like a flying saucer.

https://en.wikipedia.org/wiki/Gamera#Capabilities