Permanence

Rook is lost.

He was trying to fulfill a debt of gratitude. Indeed, he was compelled, duty-bound by his very nature to fulfill it. The situation, however, got out of hand, forcing him to abandon his friend lest he be destroyed.

Of course, this was intolerable. He swore to her he would repay her kindness! He SWORE it! To leave her to struggle alone in her time of need...! It wasn't long before he began seeking her out in earnest to make things right.