Just kidding! It was only a friendly shove. Rizzo and Castillo are actually former teammates. They spent time together in Chicago from 2012 through 2015. Look at that smile.
The ump thought he was going to have to break up a fight until he realized these two baseball pals were just goofing around and having a good time. He got a kick out of it too!
It's easy to get caught up in being serious about sports, but sometimes it's nice to remember it's all just a game! And games are supposed to be fun. Kudos to these guys for being able to share a friendly sports laugh.