Asus knew his hornets weren't gonna be useful when it came to taking down the Marines, the roof was too high to throw anything on and letting them hover out of sight wouldn't work due to the noise. Still they might help in making it impossible for one of the non cannoneers to hit her which was better than nothing, even if it was unlikely they would reach in time to make a difference. 

[color=ed1c24] "Bachi Bachi no Kamen."[/color]  He sent out ten hornets without to blind one of the Marines not working of the cannon. After all even if they couldn't reach they might still make for a decent distraction especially of one of the rooftop sitters saw what happened the first time he used it.

[hr]
Total number of hornets in Asus' body is 75. Number of hornets used for combat 50, hornets currently in use 10/50, dead hornets 3/50