Cemal was at a loss. He'd not felt so lost since the night he'd killed the late North Captain. Years upon years of hunting, of sacrifice, of existing but not living, and all he felt at the end of it was lost and empty. The man had deserved to die, but he hadn't deserved all the years Cemal had wasted seeking revenge.
This felt similar, in that it left him feeling broken, alone, and too hollowed out to cry. The worst part, the final stab of the knife, was that the Oath had clearly been broken. If they were still bound, Sule and Mahzan would not have been able to leave so easily, surely.
Mahzan must have broken it when he shattered the mental bond he'd built. All this time they'd thought the Oath unbreakable, and apparently Mahzan could have broken it at any time. So why hadn't he done it sooner, given how willing he'd been to leave?