I had some experienced writers read a draft of my screenplay, and they point out how they thought it was a significant plot hole. They said that it is not explained why the main cop character does not call for back up. I wrote so that he does it alone, mostly because of budget. I am writing for a low budget, since I am new. But I was told by some, that this is a major problem. However, there are several movies I have seen where this happens. What about movies like Celullar (2004) for example, where the cop does not call, and decides to have a look around a house himself? Seven (1995), and Point Break (1991), also had stories where cops did call for back up, once they spotted the villains in the commission of a crime, and decided to go after them and handle it by themselves. Seven when they go to John Doe's apartment. They have a reason for going there by themselves. But once Doe shoots at them, they decide to chase Doe by themselves, without calling for help for the whole chase. In Point Break, the two cop partners stake out a bank, themselves on a hunch that it might be robbed. No reason to call for back up, cause it's just a hunch, but once they spot the robbers, they go after them by themselves and still do not call for back up. Why? Heat and Lethal Weapon also do this. Is it possible to write a screenplay where people will not complain about the cop not calling for back today? I mentioned those movies to them as examples, but one of them got back to me, and said that he cannot comment on the success of past movies, he just knows what will be believed as oppose to not be. What do you think? How can I write so that the cop just does not call for back up, and it's just not explained, like those movies?