I ran Boston last year and was fortunate enough to qualify for a seeded number where I was able to cross the starting line 14 seconds after the gun sounded. I believe Duke and RNR girl experienced the same feelings at the start that I did. I didn't want to start too fast but I felt I didn't have a choice with the swarm of runners trying to pass each other and other runners nipping at my heels. I didn't feel in danger but I felt if I had tripped I would have had a difficult time getting up without being run over. Something inside me said go with the flow until it thinned out a bit. After about 3 minutes it was okay. If you can start slow it would be wise but it may not be possible depending on where you start. Why do people start out like that when they know full well that it is impossible to keep up that fast pace?