Generally there are two kinds of "bystander" injuries: kids running behind a mower when it's backing up and objects getting caught in the mower blades and then shot out at a high velocity and hitting someone. Best way to avoid both - make sure everyone is inside when mowing 
Turn Around Randy: Be sure to clear your lawn of objects and bystanders before mowing #TuesdayThoughtspic.twitter.com/IQvnrt4pnC
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