You need to add in the information about the orc gladiator. This enemy in elite maps have either a mohawk or a pointed hat and you can differentiate them from the grunts by their weapon and extra armor. After you kill the healer, it's important to take down the gladiator as he buffs himself and all orc mobs. In elite maps he does not have an icon above the head (like they do in regular maps). After the shields drop when he dies the elite orcs are a lot quicker to die.

The StS description of the gladiator is:

Orc Gladiators gain Thirst for Blood. When a nearby player dies, Orc Gladiator gains 5% damage, up to a maximum of 25%. Lasts until the Orc Gladiator dies.