Scanlations - Azumanga Fight 2
Notes: The comic on the right features Yuki, Rina, Chizuru, and Hatsune. Chizuru is probably afraid that these famous idol singers will find out her true nature...
The comic on the left features Kotone (it seems like everyone is a fan of Rina), Eimi, and Yuu. Yuu is whacking Eimi with a halisen, the weapon of choice for people from the Kansai region of Japan. ^_^ The SFX is "PAAN", which is the word used for a "sudden impact".
Source: Leaf Fight Trading Card Game: Visual Fun Book,
Mediaworks, ISBN4-8402-1525-1, p.139