one of the many journalists was producer steve stilva of boston.com.e was at the finish line when the bomb went off. here's his dramatic video and what he was thinking. >> i was squared up right on the finish line and right off to my right out of the blue, it was a loud thump and a thud. it was a thud noise and smoke went up in the air. for a split second i thought is this some kind of a fireworks or some runner, famous runner coming across? a few photographers, videoographers, we ran toward the area. as we're running under 20 seconds later the second bomb went off one block up. so we knew it was serious. you can immediately see the carnage. the problem was the people that were injured in the blast were on the other side of the partition to keep them off of the racecourse. so everyone had to pull the partitions away to get to the people. and then radio the people in the medical tent. then the police came. but you couldn't get outside help because all the roads were blocked off and the sidewalks were thick with about 10, 15 people. people were just runn