Don't be afraid to take a second look at it, however, and improve upon it. How can you make it even more engaging and more visual?
You might also think of your hook as a sequence of scenes, rather than as a single engaging moment. Depending on the kind of story you are writing, more than one "gripping" thing can be going on.
Later, when you start marketing your script, you will find that people in the industry will request your script to read. This usually means that you can be sure they will read about five or ten pages - and that's about how long you have to grab their attention.
So your hook is an important "marketing tool" as well as important to your story - in fact, it probably is more important as a marketing tool! Actually you might even have a hook in the "spec script" version of your story that ends up getting cut by the time the script has gone through development.
Here your task is to engage the reader as soon as possible. Your hook is your tool for doing that.
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