It's a simple thing, really.
Visiting team's down four runs in the top of the sixth. Leadoff man reaches. Next batter has no power but he's really fast.
So he bunts. It's a decent bunt. It's going to be close at first base.
If you're the batter, do you run through the base, which is the fastest way to get there? Or do you dive head-first into the dirt?
And if you're the official scorer and the batter/runner is dumb enough to dive and makes an out, do you debit his batting average? Or do you give him credit for a sacrifice hit in the sixth inning of a 7-3 game?
The batter was Carlos Gomez, and he dove at the base and was out by a couple of hairs. He might have been safe if he'd just sprinted like a normal (really fast) person. It would have been closer, for sure.
The official scorer was the official scorer, and he credited Gomez with a sacrifice hit in contravention of all logic.
Hey, maybe the scorer will change his mind. It happens. But Gomez isn't getting that plate appearance back. And so the madness only continues...