He claims he cannot do it, as it is an instrument for good (despite him having used it to smack around the heroine Redwing moments earlier) and also, the hourglass is broken. Starr is not seen actually fighting in the resulting battle, but he is admonished later by his captured allies for just having surrendered.
He asserts he cannot do it, as it is a tool for benefit (despite having utilized it to rough up the heroine Redwing moments earlier) and also, the hourglass is shattered. Starr is not observed actually engaging in combat in the ensuing battle, but he is reprimanded later by his captured comrades for simply surrendering.