the problem? >> okay. take a look again there. as the child flips off a tube in the back. begins to struggle. life guard somehow quickly recognizes dangerous situation. what if you had to save a life? would you know what to do? >> joining us now is cpr instructor and doctor at children and women's physician at west chester new york. we saw that video. we need to know what to do if we're in this situation. do you need to scream, call 911 first? >> absolutely. if there are people around, you scream, call for help. you actually want to point somebody out, you in the blue, call 911. >> how do you get the person? >> if there's a small child, you can jump in and pick them up. if it's an adult, a lot of