kittey said: It’s not a “what”. Go read the doujinshi “The Girls Dreams Disappeared in a Flower Field” by Wi-Z GARAGE and Asatsuki Dou, which is where this page is from.
"what" can also be the reaction to the scene. Look at TVTropes.org for "what".
angrybull said: This seems odd. Usually when yukkuris are around, regardless of their size, Akyuu goes AQN and it becomes hammer time. For dosuyukkuris, she busts out the Graf Eisen.
A translation of this series would be helpful, since I'm not familiar with Gantz.
All you need to know is that anyone not wearing a suit or holding a weapon or both is typically considered cannon fodder.