“Oh, I’d be h-happy to, hon,” Redheart said, doing her best to smile. “It’s actually very complicated, but I think I can explain it in a way you’ll understand. You see, sometimes we need to cross examine a limb on a patient. Usually there’s only one such limb on the body, other times the other limbs—like a pony’s hooves or your hands—have a minute difference that would alter any results we’re looking for.”