Very good action capture with only a little blur in the bull's legs and the kicked-up dirt. I remember rodeos as a kid, sneaking into the back of the rodeo grounds (we couldn't afford a ticket) and watching the action from about the same spot as the boy in the black shirt and cap. Everything went so fast and then you heard either the 8 second horn and cheering or the breaking ribs of the cowboy. Just a word of critique, not in your composition or capture, but post-shutter; I pulled a copy off and gave it a single small tweak in Photoshop's Auto Levels, another in Exposure, one more in Vibrance and then a 100%/1 Smart Sharpen. I was able to remove that blue cast (it may have been overcast that day?) and put some brightness into the faces, lighting and colors. As I said, a good capture of the intensity of the moment and most eyes upon this guy and his "fate."
If you've ever wanted to make a difference but found it hard to believe that one person could... check out the Kiva Team Caedes discussion thread and discover that anything is possible.
-Nik