Jaime nodded to Mal's question. "A few people have crossed it." She gestured to Kaylee, and nodded her agreement. "Chase ... fell into acid. He still has burns on his legs. Someone else ... got caught in quicksand, or something. I only heard that in passing so I'm not completely sure on that. Some of us have gone to look and investigate as well as we can without crossing, but even hucking big rocks over doesn't seem to be quite enough to trigger them. Not in the area we were, anyway.
"Honestly, we're not even sure what sets them off. Whether it's our weight, or ... if they're hiding in their lab and watching with their cameras, and opening them up when we're on them." Which seemed dumb to her, but she wasn't someone running this place.
"Sir Leers-a-lot was shooting over the line the other day after he found bullets to fit his gun in the hardware store," Jaime offered. "But if anything happened, I didn't hear about it."