Politics and Compromises
The Berserkers and Warlock Centaurs pursued the last survivors of the enemy army before they returned to have someone tend to their wounds.
In the meantime, Michael was given the corpses of all Awakened that had been killed in today's battle. That was one of the conditions Michael had given to the Trilance. If they wanted his support, the Trilance had to separate the corpses of all Awakened slaughtered in the Regional War and hand it over to him. It was one of the major reasons Michael considered helping the Trilance, in the first place.
Their help was substantial, so it was no wonder that Michael and his subordinates were permitted to collect the corpses of the enemies they'd killed as well. It was not like Michael was in dire need of their corpses, but he would be stupid not to take them. Summons might drop less loot than most monsters, but with Extraction, Michael could still plunder a considerable amount of goods nonetheless.