CW: It's not so much about pride. Nor does Mal take his job too seriously. Back in the day, he pretty much WAS a monster. After Zoro blinded him, he spent several years trying to make up for his past. So it's more like he's sensitive to what he was. As for why the hell Natsu is being nice... well, wasn't Mal her sword and navigation teacher? That's what I was under the impression of.

Mal: It matters not what we were. You are right, Natsu. I'm no monster. *Stands as his cape blows in the wind* I'm a marine. And I am... a hunter.
CW: *Rolls eyes*

Mal turned and began walking back towards the field. 'Hmmm.. I can no longer see him. He must have hidden behind something. He probably thinks I'm using sonar to see him. Close, but not quite' Mal thought, holding his hand out with his palm down. Spinning his middle finger in a quick circle, he slapped his hand down, sending out a vibration through the ground. And wouldn't you know it. There was Griff, hiding behind a boulder. "I... see... you..." he taunted, heading towards his prey.