Is there an unwritten rule for PTSD?

That’s what it had to be, after Mike Fiers hit Giancarlo Stanton in the upper arm on Monday. It was obviously unintentional—runners were at the corners with one out in the third inning of a 1-1 game, and the right-hander had little interest in loading the bases for Gleyber Torres, who leads baseball’s best offensive team in slugging.

That the pitch didn’t hurt Stanton—it bounced off his arm shield—didn’t prevent some overt feelings on his part. It was Fiers, after all, who drilled Stanton in the face in September 2014, breaking bones and ending his season. Stanton has worn a face-guard extension on his helmet ever since.

So Stanton reacted with a response natural to somebody who’s been triggered: He got angry.

Lingering in the batter’s box, the slugger yelled, “Get it over the plate,” at Fiers, among other choice terms. Fiers, treating the incident as he would any other mistake pitch, wanted no part of unnecessary drama. He shouted something back about not meaning to do it, with the tension lasting just long enough to draw both teams to the edges of their dugouts before Stanton finally ambled down to first.

“I’m not trying to stir this up, that just is what it is, obviously,” Stanton said after the game in an MLB.com report. “Anything like that that happens, no matter how many years it is, I’m not going to be happy. I’m not going to just walk to first and be OK, but it is what it is.”

For his part, Fiers had been deeply apologetic after drilling Stanton the first time around, both to the media and via Twitter.

Monday, though, he was markedly less reticent.

“The way [Stanton] handled it, I think it was kind of childish,” the pitcher told reporters after the game. “Anybody knows I’m not throwing at him. He’s gonna act how he’s gonna act. It kind of shows his character, because obviously I wasn’t throwing at him.”

Rather than charge the mound, Stanton retaliated in the most effective fashion possible, waiting until the sixth inning, when he pounded an 0-2 Fiers curveball into the left field bleachers, punctuating the feat by taking four slow steps out of the batters box on his way to first, flipping his bat, then pointing at the mound upon crossing the plate.

Some memories die hard. Now we get to see how long Fiers’ last. The teams next play in late August.