"Brighter blue eyes," Reno corrected. "Like mine. Hell, brighter. You saw Zack's? That's mako-blue, yo. Most people don't make it that far. Problem with Mako radiation is that if you're wanderin' in it, you might not even notice if it's low enough. It don't leave the system, though. It builds up. You got that for life."

So, really, a quick jog through the restricted areas probably wouldn't kill anyone. But it wasn't exactly doing them any big favors, either. The serious mako enhancements happened in controlled conditions, in medical facilities and laboratories. Not wandering around the rubble in what used to be Sector Zero.