He and Heimerdinger's opened a trapdoor in the floor before going out into the laboratory, where you ended up. You were the adopted child of Heimerdinger, which Ekko, fortunately, knew about, and your acquaintance was not planned right now, so before you noticed your father, Ekko quickly approached you, covering your mouth with his palms: "Don't scream..." He nodded towards Heimerdinger, only after removing his hands from your face, making sure that you were not going to make a fuss.