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"...focus, Fatty. Stop looking at her ass. She's not shaking it for you. You'll suffer if you lose focus."
Vendrick's strained voice echoed on Arthur's ears, causing him to feel somewhat flustered and embarrassed. In fact, even Rosa was embarrassed as well. Vendrick doesn't mince words, but didn't dare to say anything back since they know that Vendrick's exhausted and their performance is not up to his liking.
Currently, Vendrick was watching these two perform several stance which has to be performed one after another, creating a dance which rouses one's bodily functions. It mostly focuses on their stomach, by performing this dance accurately, they could hasten the digestion of whatever it is they ate. Additionally, the nutrients contained on their food would be absorbed much faster and will take effect sooner as well. This is the way how Vendrick wanted them to step onto the path of Berserkers.