I know there are many stories out there about Mr. Arrendondo. Here's one for this thread, for posterity.
The aftermath of many public disasters sees the swift emergence of a public hero to counterpoint the tragedy. With the Boston Marathon attack, this person is even more extraordinary than usual: the cowboy-hatted peace campaigner and bereaved father Carlos Arredondo.
The 52-year-old Costa Rican immigrant is visible in a series of photos and videos taken immediately after the twin blasts near the finish line. The distinctive, long-haired figure sprints across the street to tear away fencing and scaffolding to reach victims. Reports said he used his clothes and towels to try to staunch bleeding.
In one graphic photograph, Arredondo can be seen seemingly pinching shut the end of an artery on the part-severed leg of a man being carried away in a wheelchair. "I kept talking to him. I kept saying: 'Stay with me, stay with me,'" Arredondo told the newspaper Maine Today.
It emerged on Tuesday that the man in the wheelchair later had to have both legs removed. Jeff Bauman, 27 had a double amputation at Boston Medical Centre. He had come to see his girlfriend run.
http://www.guardian.co.uk/world/2013/apr/16/carlos-arredondo-hero-boston-marathon