That could have been much worse.
I remember a high school coach taunting me, in fun, to hit him with a discus. He was a long ways away and neither of us thought I'd be able to pitch it that far. He was at least 20' further than my best ever throw. I went into a spin and pitched it hard. Everything worked perfectly, and because I was spinning didn't see him turn and start to walk away until I had recovered, but by that time the discus was halfway to him. I yelled and he turned back just in time to have his legs taken out from underneath him. Fortunately, he wasn't seriously hurt, but I was really shook.
Can't believe the kid that threw the javelin went on with the competition and won it. Maybe that's why I'm a photographer today instead of an athlete.... Well, that and a few extra years and pounds...grin.