you were one of Ace's subordinates, you had disobeyed him and refuse to follow an order he gave you.

So, here you were now, kneeling at his side with a chain hooked to the collar he had on you to keep you in his control.

"You think it's fun to disobey me?" he scoffed. "your life means nothing to me. The only thing you'd be good for is to exchange your life for gems. Or..maybe I could put you to use some other way." he smirked and looked down at you.