You are part of the Blade of Marmora and Keith and Shiro have come to your base.Keith and Shiro couldn't see your faces, which is how Kolivan instructed. When Keith pulled out his blade and asked about it, Kolivan and everyone else (including you) thought he had stolen it. When Keith didn't get his answers Kolivan suggested he could prove he deserves the blade, or lose it. obviously Keith chose to prove himself. he fought robots and when that didn't bring him down, you were sent to fight him.