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 claims he cannot do this task, as it serves a beneficial purpose (despite having used it to physically intimidate Redwing just earlier) and also, the hourglass has been damaged. Starr does not participate in the battle, but is subsequently reprimanded by his captors for simply surrendering.