The blast broke his left femur and the tibia and fibula of his right leg. “I got thrown across the street, and I was tied up in a chain-link fence on the ground,” he said Thursday. “I tried to wiggle my toes because I couldn’t move my legs … Then I looked at my right leg, I knew it was broken at that point.” St. John don’t want to be considered an hero. He is a father of three. This was a major gas leak in the place at the explosion site..The gas was so thick the firefighters could see waves in the air. The building blew up in three blasts — one for each level— with a slight pause between each boom, St. John described. The intersections near the blast site were still closed Thursday.