Tyra Winters, a high school senior and cheerleader, was on a parade float when she saw the desperate mom crying for help. "I see the kid. I see a little bright red face, and his mom is holding him up begging for help, screaming, asking, 'Someone help me. Someone help me,'" Winters said. "My very, very first thought was like, 'Oh my God. I got to help this child.'" "Her kid is turning purple, so I immediately jumped off the float. I ran down to the kiddo, and I was like, 'I got it,' and I just grabbed him from...