Detonator

Because Batman can't get to the last bomb that's been set up.

And once Firefly, you know, like during their fight against Detonator tries to set it off and it doesn't go off.

I mean, that means Gordon was able to get it, but even Gordon says, you know, Hey, you know, I should have given you, I should have given you the access codes.

That way you could have gotten to the bomb in time, you know, instead of, you know, trying to himself and say, Oh, you know, if Gordon didn't give the breach order, then they wouldn't have gotten to the bomb.