Then you also don't understand the context of the characters in question. To an orc, dying as a slave without a weapon in hand and not on the fields of battle, is the most dishonorable way of dying they can imagine. Being unable to fight, and living that way, is worse then dying in combat to orcs.
so saying 'they got of light' when every account of it tells the orcs saying it was the worst moment in there lives, theres a reason for it.