In films, assassins are depicted as cold and unfeeling, harsh towards their enemies and even harsher on themselves. However, real-life assassins are quite different, there might indeed be some who are as portrayed in the films, but the assassin Ye Fan and Zhang Ming have encountered is nothing like those in the movies.
Seeing Zhang Ming going to fetch bricks again, the assassin decided to surrender without hesitation.
As the saying goes, a wise man does not eat the loss before his eyes. Right now, the place the assassin most wanted to be was the police station, where at least he wouldn't be beaten up. As for escaping later on, he believed his organization would figure out a way. Moreover, he had indeed intended to assassinate Ye Fan, but he had failed to succeed, so his sentence wouldn't be that heavy. And his previous deeds? As long as the assassin clamped down hard, the police wouldn't be able to do much without evidence.