He protected her from the fire extinguisher system .

>“No!” John ran, unsure of his plan as he jumped into the circle, shielding the center flame from the foam with his body. The pain grew as the flame cut through his coveralls, then stopped, more than stopped. He felt great. Had he been afraid?

>She stood and brushed herself off, sending a cloud of soot up again. A small drip of more foam came from the ceiling in reply. “Ah,” she yelled, laughing. “Can you turn that off?”

That second part to me says the system could hurt or kill her.