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This is tragic to say the least. My son plays competitive baseball, they played 55 games this year. Most of the fields they played on are very tight compared to major league standards. The on-deck circle being literally just feet off the foul line. So many kids get hit with foul balls it's scary. Yes, they have helmets on, but from 20 feet a ball in the back does not feel good. These are 15 year old players that can smack a ball, and are using aluminum bats. It takes someone getting killed to cause any changes. That unfortuately, happened here in Dallas this year. A boy my son's age took a hit in a batting cage. The ball somehow made it through the net. Myabe jman was right, in that since it doesn't happen very often we overlook the danger. Sad, none the less.
Some in this thread have opined that Coolbauhg might not have been paying attention. I think it is possible that he was indeed paying attention, but just could not see the swing. If the batter was left-handed, then Coolbaugh, standing in the 1st base coach's box, might have had his view of the ball blocked by the batter's body. In that case, he would have lost a precious few milliseconds of reaction time, and he might not have been able to pick up the ball off of the bat at all. I agree with dviking about the hazards of being in the on-deck circle. The only saving grace here is that usually, at that angle, the ball is not coming off the bat as hard as it would on a line drive just foul. It's still best to be "heads up" at all times.