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He passed Agnes outside of the Vision Residence, and she jokingly shot finger guns as him after he joked about simply being a messenger.
When Maximoff and her sons, Billy and Tommy Maximoff, went out looking for their dog, "Dennis" passed them and told them not to worry, as their mother would not let him get far.
Later, "Dennis" and the other Westview residents paused to witness Maximoff using her powers in broad daylight against Monica Rambeau. He and the others then resume going about their business once Agnes comes by and takes Wanda. Maximoff eventually took down the Westview Anomaly, freeing "Dennis" and all of the citizens.