In his column yesterday he sheds more light on that:
John Hart dressed down manager Brian Snitker. Shouting at him so loudly in the manager’s office that some players heard from the clubhouse . . . [Snitker] appeared almost ashen and uncharacteristically sullen minutes later when reporters entered the office, and really was never quite himself again the rest of the season.
He also writes about the response it elicited from Braves outfielder Nick Markakis:
. . . upon hearing what Hart said to Snitker . . . Markakis made it known, had the message sent up the chain, that if Hart ever treated the manager that way again that Markakis would, in so many words, kick his ass.