"Male? Between 16 and 30?" Y blurted out. "What makes you so sure?" he demanded, confused by this deduction. It was quite strange that these people had already started to present their thoughts on the case in order to solve it before they were given any information other than a vague description of the people the police thought Kira had killed. They're just making things up. There's nothing that suggests any of what they say is true. They're all possibilities but they're just creating an imaginary case.
He turned to R. "Excuse me but I don't think that this really counts as pointing out the obvious. I'm really confused by some of these assumption that don't really make much sense and if they are true, that means our opponent isn't really as smart as someone has pointed out. How does everyone in here know so much about this Kira without having any significant information about him whatsoever?"