Maru missed Madoka's moment of confusion. He probably should have explained to her how the bow worked, not that he really knew himself... he'd never seen the weapon before in his life. But it just stood to reason they would have just appeared when she needed them. He hadn't told her though. Luckily she was clever and worked it out, because he was far too distracted by being pet...

He opened his eyes when she addressed him though. "You're welcome."