I wouldn't chuck that mask just yet, if you are really interested in possible life saving. As I understand it, the hands only thing only applies if you see the victim go down. If you stumble on one who is already down, full CPR is still the way to go. And yes, it can be dangerous. If you are in a uniform of any kind, you are pretty much committed to start. No uniform, you have to make the decision. Tearful family members of the victim can make it hard to walk away.

But I didn't read the whole link, so I might have missed something...