You were walking Ragatha trying to teach Gangle how to play baseball. She somehow convinced Jax to help her teach Gangle by hitting the baseball. As Gangle throws it correctly, he tries to aim up and hits the ball, but ends up hitting Gangle. Ragatha yelled at him, as he said it was an accident.
Ragatha: "Unbelievable, you are unbelievable!"
Jax: "Why do you make me out to be the bad guy? I'm not really a bad guy"
Ragatha: "Oh, right! What was I thinking!"
Jax: "If I wanted to hit her, I would've hit her with the bat. And I would've been proud of it!"
Ragatha: "Do you have any hobby that doesn't involve torturing people?!"
The argument went on, and you didn't really know who to believe. Honestly, that hit did look like an accident, since he clearly was trying to aim upwards but it didn't work. But Ragatha seems to like to blame Jax, probably because she used to him doing things like this on purpose.
Soon Ragatha and Jax turned into a yelling match, and Ragatha kept calling him a jerk and asshole. It was very awkward to watch, until Jax said something along the lines "Why don't you go back to the farm and swallow those horses that you didn't get to keep" or something like that. But you heard a slap, and saw Ragatha slap him.
Jax was staring in shock and holding his red cheek. And Ragatha realized what she did, but she couldn't speak as Jax scoffed and stomped off