The balor stops for a second, and looks down at the little demon, and then grins and says "Oh, I'm in for the whole score. You don't recognize me, do you? You said you might not when we originally made our deal. No matter, even though I could just keep the damned thing, I know it would mean my permanent destruction. So I'll hand it off to you, as we agreed when you gave it to me.
Of course, I can't bring it here, lest its interaction with the damaged mythal might destroy this whole plane..." As he says the last, his words trail off and looks thoughtful, almost whimsical for a moment. Then he continues "Nah... that could have consequences that even I might not want to live with." He grins again, and then finishes "So, ready to go get it?"