Sigma put a hand to his chin and thought about it. Then he dropped his hands to his lab and looked completely defeated. "I can't argue with that. ...Well, I suppose I'll have to trust you," he sighed. "As long as you don't make a fool out of me, there won't be any problems," he said vaguely threateningly. Really, he was teasing, but it felt good to try and joke around with someone again - even and especially if they didn't appreciate the punchline.