In this April 2013 photo, Boston EMT Paul Mitchell, left, bystander Carlos Arredondo, in cowboy hat, and Boston University student Devin Wang push Jeff Bauman in a wheelchair after he was injured in one of two bomb blasts near the finish line of the Boston Marathon. The first feature-length documentary film highlighting historical moments of the nation’s oldest marathon is in the works, tentatively set to premiere in April 2017 in conjunction with the 121st running of the race.