Random inside joke at the end, Air Groove is reacting to the flash because the IRL horse was really bad with flashing lights (like cameras).

Farran said:

Random inside joke at the end, Air Groove is reacting to the flash because the IRL horse was really bad with flashing lights (like cameras).

Also a reference to the 2nd season anime with has Air Groove acting the same way towards a camera flash (itself also a reference to her IRL counterpart).