Is there anything I can do and was I wrongfully fired due to the fact they waited two to three weeks later?

At my job me and a young man was playing in the hallway when I softly tapped him on the cheek. He began to chase me with a mop and I began running from him. I then stopped running because I didn't want to run all over the store and end up getting fired. So then the young man tapped me on my shoulder with the mop and I didn't proceed to continue playing. I then continue to go on the rest of my 15 minute break. Two and a half to three weeks later, the store fired me out of nowhere. Then when I talked to the store manager, he told me he had no idea me and him were fired. He didn't find out until 2 days later for him and a day later about me being terminated. I heard that an assistant manager is not supposed to take the actions of firing employees without the store manager knowing anything about it.