Satisfied that she had won the debate, Beatrix smirked at the two girls smugly, revelling in her massive maturity and adultness. Granted, she couldn't quite recall the specifics for why she felt the need to prove these traits, but nevertheless! Now that her superiority had been proven, they had no choice but to accept it.
Uiharu then had to remind the obvious adult about the alley, causing Beatrix to eye it warily. It wasn't like she was scared or anything! ...Alleys were just... um... they weren't good for you, so that's why she didn't like them any more!
But of course, the tallest of the girls had to act all fearless and stuff, and there was no way Beatrix was letting her seem like the bravest when that totally wasn't true!
"Hmph, worried about a mere alleyway? So childish..." Beatrix muttered, averting her eyes. Which was totally not a sign that she herself was worried about anything! That would just be silly.