It doesn't make any sense. Kang got hurt in the top of the first inning of that game, and no Cubs were hit afterward, intentional or otherwise. The idea that they stewed on the injury and then unleashed their fury in the 7th inning of their next meeting(after they had already hit Russell on accident) is more than hard to imagine. They were salty that they got beat(with their ace on the hill, and by the team ahead of them that ended their season last year) and probably annoyed that Marte was banged up(by getting hit for the league leading 6th time already), so they threw at Zobrist to retaliate. It was dumb and they are dumb for doing it.