"I carry one," Layla replies, giving him a quick, wry smile. "There are some situations where a cellphone won't do the trick. It's just too small and not sturdy enough to be useful for this."

She scrutinizes the spiraling tunnel of lasers, hands absently skimming over her vest to make sure all her gear is packed down tight.

"I'll go first. If I burn a foot off, at least it'll show you where not to step, yeah?"