The firefighters... now?
At some point, when the precinct is on fire, Marcus says they need to hurry up because the firefighters will be there soon.
Ok, the precinct is on fire, so naturally the firefighters will show up. But why now? I mean, good cop and bad cop have been fighting all night. There have been several shootings, grenades, helicopter and even a bus exploded. None of that was enough to call for help and until that moment Marcus was never worried if his little war was going to draw attention of others. But suddenly a simple fire will rain on their parade. It makes no sense.