She listened to what he had to say before punching him square in the head as hard as she could. She's had practice when it comes to these friendly punches it was strong enough to make her point without causing any real damage to the boy.

"Like hell I'm going to die here!" She stood up tall crossing her arms in front of her chest. "You can go and die but don't get the rest of us caught up in your mess."

Nami didn't think you had to die to complete some goal and she was quite all right without being a hero.