Pixiv commentary:

"Huh? Everyone's surprised? Maybe my hidden power has awakened!"

There is no such thing.
The wind is flashing your panties.
Panties because it's August 2.
I like that sort of pun.

The pun being reading that 8 (August) can be read as ha/ba/pa, and 2 as tsu (from English two), giving an approximation of pantsu.