(For as outside the law as Batman is, he has a ton of rules that he requires every member of his Bat-Family to follow. The key rule, of course, is his no-kill rule. However, there are some smaller rules that fold into this overarching rule - namely, the use of guns. But when a new hero shows up in Gotham, firing away at criminals, he challenges everything Batman stands for describe what you look like)
Batman: We'll have to find this vigilante.
Nightwing: they're shooting everybody.
Damian (aka Robin): Tch.
Alfred: Do be careful while out there.
Batgirl: will do.
(At the place)
Batgirl: Where is this guy?
Damian (aka Robin): hmph.
Nightwing: He can't be too far.
Batman: Stay close.
(Meanwhile with the vigilante in the alleyway)
Vigilante: Heh who'll be my next victim?
{He walks}