After the reinforcement of the three neighboring Lords arrived, Michael began to use bits of his focus to store away the corpses of those he and his people had killed.
He couldn't be sure how amiable the other Lords and their forces would be and if they would allow him to take away the prey that was rightfully his. Thus, Michael stored the corpses whenever he retracted the tendrils of Extraction that had anchored in the corpses of those he killed before.
Paving a way through the rows of enemies with Zira allowed him to store the corpses of the Guards and Awakened killed through Mika's duplicated heirloom arrows as well.