00F chapter 2 starts with the Fereshte discussing about Custom Flag. Fon deducts that Custom Flag sacrifices a lot for its mobility. First, to make it faster than normal Flag, Custom Flag has weaker armor (and I think the anti beam coating is for defense against Gundam's weapon, if it is hit by normal projectile, it may suffer heavy damage). Next, Custom Flag's prototype rifle can only fire the powerful shot that knocked off Exia once. According to Fon, Custom Flag's first few attacks were to confuse Exia and then fire the powerful shot, too bad it failed to destroy Exia with it. Lastly, Custom Flag has only enough energy to conduct one mission before being recharged. Fon remarked that Setsuna did a good decision by escaping underwater since Custom Flag can't move underwater and has no remaining energy for pursue.