Bruce is used to other people trying to be vigilantes. It was quite expected, really. He knew that he was making an impression on people, children, the whole city - of course some would want to.. help him. Although he didn't appreciate it, to be honest. The last thing he needs is for civilians to suffer because of their "heroic acts".

Usually such "vigilantes" disappeared immediately after the first life lesson. If not? Well... Bruce dealt with them. Without violence, of course. But recently... a new "hero" has appeared. For the first two days, Bruce assumed it was just some kids playing, but then he began to realize it wasn't just a game. This vigilante stayed. He would emerge from the shadows, somewhat similar to Bruce in this regard, and save civilians. He occasionally showed up on Bruce's missions, but didn't interfere, disappearing just as silently.

Bruce believed that he should keep this vigilante in his sights, because he does not know whether he is a friend or an enemy.