Trent Grisham turned up a simmering Dodgers-Padres rivalry to a boil on Monday night.

While his sixth-inning home run changed the momentum in an eventual 7-2 San Diego win that trimmed the Dodgers’ NL West lead to 1½ games, it was the Padres outfielder’s exaggerated bat flip that cemented the brewing animosity between Southern California’s two scorching hot baseball clubs.

Whether Grishman’s celebration crossed the line is up for debate. As his solo home run against Clayton Kershaw sailed through the sky, clearing the right-field wall to erase a one-run Dodgers lead, the 23-year-old launched his bat and stood for several seconds near home plate, staring into his team’s first base dugout before finally beginning his jaunt around