If this flow isn't in focus, however, then probably your complication isn't closely enough related to the spine of your story. Remember the over-view of three-act structure:
You are in the beginning stages of the first part of that broad story movement: getting your hero up a tree, the moment of which will be the plot point that ends the first act. At this early stage you must realize that nobody puts the hero up that tree; s/he gets there by his/her own actions or reactions.
If the hook hasn't already done so, the complication begins the story's movement toward the central dramatic problem (what is the story really about?), and the hero's decision (the "call to action") is a response to that complication in the form of a decision to act.
Without a call to action, there would be no story. Benjamin would decline to have an affair with Mrs. Robinson, and the scientist would refuse the invitation to visit Jurassic Park.
Writing without an outline, your burden as a forest person is to keep in focus, to keep on track - and this can be done if you keep your hero front and center, which can be hard to do when your hook and complication involve other characters, as often is the case.
After your complication, take a time out to remind yourself what your story is about and to remind yourself that it's time to bring your hero front stage and center (if s/he isn't there yet).
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