At the beginning of the movie...

... when our two main characters, one on the ambulance and the other in handcuffs on the way to custody following his arrest, get taken away, is it not too realistic when those criminal men, right within the ear drop of the police officers, shout some very rude and obvious obscenities at them and even outright demand some kind of payment for their service?

What if the police was to hear them and they would be recognized and thus alert attention and arouse suspicion, and the police may eventually find out that they are some kind of criminals etc?

Also, when that lead criminal came upon the injured Marcus and again right near the police officers started to verbally intimidate him, wouldn't that also cause suspicion?

What do you think, thanks.