Wow Gumneck, thank you for your 'armchair' perspective. It is advice well-taken and appreciated. TreeCo pointed the same thing out - I simply shouldn't have been in the area, period. I knew that when I was power blowing the yard. I waited until he was half way through the second half of the stump, the point where the stump is diminishing quickly. I was timing my entry, knowing he'd be out of there in just a couple minutes.
The timing and all worked out, but the point remains: I shouldn't have been there in the first place. I have seen stumps being ground many, many times, and I have seen guys stand or milling around nearby. They are in the danger zone. A rock can be thrown, a tooth spit out, an underground cable yanked or any number of things. Gumnecks point should ring clear to everyone; "maintain distance from the beast of burden." The only person that should be nearby is the operator.
An injury doesn't just affect the injured person. It will affect fellow employees, family members, friends, clients, neighbors, etc. In my case, I'm bringing it to the world stage, with the intent of it affecting YOU and the way you approach your safety behaviors. Think of the close calls you've had where you got out of it, but could have been here telling your story. Think tomorrow what you're doing, what your fellow employees are doing. Just heighten your awareness, especially, as others have made mention, toward the end of the day. Men's minds drift to where they'd rather be, what they're going to be doing later, etc. This is an employer's biggest fear; someone getting injured on site.