John got sucked back into work. A guy twists his arm to do a job for him. Then John kills him at the end inside the hotel, which is neutral ground. He broke the law, so now all assassins on earth are free to hunt him
In 3, he started dealing with that. He runs around fighting off enemies the whole movie. At the e d he fell off a roof and then wakes up in the sewer with that guy who controls pigeons. And they plan to prepare for more fighting