One of the many heroes from yesterday's tragedy in Boston, is Carlos Arredondo.

Arredondo helped a young man in a wheelchair to safety after the explosion. He pinched closed a severed artery, stopping the flow of blood from the victim's leg.

Carlos had a personal reason to be at yesterday's Boston Marathon, he was cheering on a group of runners that were participating in the race on behalf of fallen veterans, one of which was his own son.

In this video, Arredondo appears visibly shaken as he explains to bystanders about what happened.