Seems like If is carrying some karma for the Nats. There is a replay of Kershaw after Soto hit his he. He just squares down and hung his head. Off in the background there was a guy in a Caps home red standing as the ball went out
After Howie's grand slam, as the TV showed people filing out of the stadium, they showed a couple Dodger fans stopping to congratulate some Nats fans, shake hands, give thumbs up, etc... the Nats fans, one of them was in full Caps home red jersey. Maybe the same guy you saw? It was a cool moment, being on the good side of that exchange for a change.