The first place I saw this didn't have as many details as this source.
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Sounds like the guy did a very poor job of evaluating his backstop.
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A 45-year old man, who lives across the road from where the boy was shot, contacted deputies after they arrived on scene. The man told deputies he was in his home when he saw a deer in the front part of his property and shot four times, killing the deer. After learning of the boy's injury, the man told deputies he thought one of the rounds may have struck the boy whom he did not see in the background less than 100 yards from his house.
Sounds like the guy did a very poor job of evaluating his backstop.