There is a chance that another allied Orc will see this, and show up soon after to Betray you, seeing the humilation as a sign of weakness.

Humiliation - There is a hidden bonus some Orcs posses that - if they send the player into a Last Chance attempt - they will forego the Last Chance and instead humilate Talion by not even bothering to strike the final blow, and leave.Dominated Follower Death - Upon the death of an allied follower - whether during a siege, Nemesis Mission, Fight Pits, or accident - there is a chance that the Orc in question may gain the perk of Cheating Death as well as Betrayal, and ambush you out in the region.