I read the story. And I used to watch Bryce Harper play catch with kids in the stands. I was even at CitiField, sitting near the rail along the 3B / LF line when an adult with a glove waved at Bryce for a toss. Bryce saw that the guy had a little girl on his lap, so, instead, he walked over to the stands and handed a baseball to the fan.
The story suggests that the bush league Baltimore fan was not paying attention when he threw. Typical of Baltimore, which claimed that The District was Orioles territory.
In fact, I met CALSGR8 on an old Washington Senators listserv. She organized a protest against the Baltimore team when the ownership demanded that MLB never take "their" territory for a team in Washington. That's Baltimore.