A rather hoffed sound was expelled from the elongated mouth, the sin fully aware of the presence of the now moving roughly 10 feet away from his current position among those trees perched on the hill. He didn't even have to look to know where the human currently was, but look he did all the same; eyes narrowed slightly and ears following the sound of the voice.
Envy had been fully prepared to deal with the Fullmetal brat, he was not as prepared to deal with this sudden shift of everything. Both the landscape of strange tall structures that sort of resembled buildings of nothing but glass, and the human apparently dressed in garb that the sin didn't recognize. He knew he hadn't taken a wrong turn somewhere, and yet it seemed that everything was topsy-turvy without a semblance of something recognizable.
Instead of giving up the game and changing his guise straight away, the sin remained as he was, a nightmareish creature staring at a human of unknown origins without speaking a word.