I thought his conversation was about saving someone yourself before 911 get's there. There is a big difference between someone passing out and the heart stopping in front of you (or someone drowning or whatever) and doing CPR instantly. Seems that would be very advisable and useful. Telling people it's useless because you base it on what your friends in the field say after arriving 15 minutes later doesn't seem a fair comparison. And misleading. Plus if there is any chance at all its worth trying either way.