A little odd that she doesn't know, but perhaps there wasn't a brochure stand near her entrance into the Nexus. After all, this place is infinite, so the odds make it more than possible she simply missed it. "It's some kind of magical property of the Nexus, I think. Stops people from attacking each other at will, although it's stronger some places than others, and it can be flexible if both people agree to fight, like if you wanted to spar." He's not going to mention that apparently it's been disabled before - the less people who know that, the less likely it is that someone will seek out a way to do it again.

Jim gives that a moment of thought. "I'm not sure if there are hospitals here, but there's probably one somewhere, and they'd probably have a supply for transfusions. Might be worth checking out."