[ Homura's shield and costume are already rippling away into her everyday clothing. She's reminded of Madoka at what Mato says, and it's a bittersweet sort of feeling. ]

...No, I had nothing to do with it. You're improving. That's all. But you shouldn't slack, either. If you don't have any confidence alone, you'll end up dead.

[ Needless to say, getting cocky means the same thing. She's just being honest, even if it's blunt. It's how this tends to go; she speaks from experience. ]