Envy growled quietly, still somewhat near by the quarrel that was unfolding. He didn't quite catch their conversation, but he knew that Greed was one of the Homunculi that Father wouldn't really care for, so, maybe he could kill him. Shifting into a canine, he darted forward at the arm Greed was using to hold Teirra. His jaws opened with a snarl and he snapped, ignoring the total fact that he was 'The Ultimate Sheild'. Being another Homunculus, he could still get to the point in Greed's armor where he could break it, knowing a few secrets that he'd kept to himself.