Its name is Barn, and it is widely known as a "smart" Orc.
The so-called "old things" is what the green-skin Orcs call the pure-blood Orcs.
The two actually despise each other. Pure-blood Orcs consider green-skin Orcs to be cheap and vile, while green-skin Orcs regard pure-blood Orcs as "cowards even afraid of death."
However, under the mediation of the Great Chief Solo, who carries the blood of both kinds, the green-skin Orcs temporarily submitted to the strength of the pure-blood Orcs and were tempted by their rhetoric to "plunder Aivendel". Only then did they come to the front lines as cannon fodder.
At this moment, realizing the truth, some Orcs thought it better to fight those "old things" than to die meaninglessly on the battlefield, at least they could have a satisfying kill spree before their end.
In their hearts, who they were fighting wasn't important. What mattered was having a fight—seeing blood, killing.