An ER doctor from Boston's Tufts Medical Center said the video and reaction from Bills safety Damar Hamlin seemed to indicate some type of cardiac episode. Subscribe to WCVB on YouTube now for more: http://bit.ly/1e8lAMZ Get more Boston news: http://www.wcvb.com Like us: https://www.facebook.com/wcvb5 Follow us: https://twitter.com/WCVB Instagram: https://www.instagram.com/wcvb5/