Someone in Porre needs to be shot. Probably a scientist who watched one too many Shounen anime. When you make a secret weapon, it's not supposed to end up hurting your troops. Guns don't shoot whoever's holding them, tanks don't turn around and run over the foot soldiers, and bombers don't suddenly decide to blow up HQ.

So why, oh why, was a cyborg designed to respect strong warriors, ensuring an eventual backstab at the moment of defeat?

Shoddy programming aside, Grobyc is as deadly a warrior in the arena as he was in the field of war. With hidden weapons to match his martial art prowess and razor-sharp follicles, anyone who faces him will need to keep their senses sharp if they wish to survive. While he downgraded to Middle when Fantasy proved to be superior to Sci-Fi, Grobyc is not a bit disheartened. After all this only goes to show that the battlefield he's in is full of strong warriors.