The Wonderbolts have been enjoying a quiet day of training at the Academy. Spitfire was probably doing a bunch of paperwork, hence why she wasn't yelling or barking orders.

So when Rainbow Dash walks into the fiery mare's office to tell her of a problem that would surely anger her to no end, Dash finds that Spitfire is... extremely silent. Almost emotionless. Not like her at all.

Since Twilight is unavailable, maybe Fluttershy can help.