Unless there's glue.
In Plot and Structure, James Scott Bell gives one of the better explanations for this aspect of characterization he calls "adhesive." He defines it as "any strong relationship or circumstance that holds people together" (81). In other words, adhesive is the compelling reason opposing parties can't just peaceably part ways.
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Adhesive is usually found in the reasons behind your lead's pursuit of her goal and your antagonist's opposition of your lead. Bell lists some broad categories:
~Life and death. If the opponent has a strong reason to want to kill your lead, that's a powerful glue. Your lead's struggle to stay alive is a powerful motivation to keep on keeping on.
In some genres, fear of losing one's identity, autonomy or reason for living--in other words, fighting to escape a psychological death--are the driving force. The lead must change and grow or die inside.
~Professional duty. Readers can understand how a doctor won't give up on a patient, for example. Our professional lives are often tied up in our sense of purpose and reason for living. To fail professionally means a kind of psychological death.
~Moral duty. A husband whose wife and child are kidnapped won't sit idly by. Nor will a pastor who discovers one of his parishioners is being abused. To give up on doing the right thing would mean letting evil prevail--a spiritual death.
~Obsession. Someone who has lost touch with reality may become powerfully locked to something they desire--whether it's the celebrity they stalk, and object they believe will empower them or a family member they need to control and dominate.
~Physical location. This is a setting-based twist on the life-and-death adhesive. Opponents might become stuck in a place that would be more deadly to flee from than to stay in. Think of the family snowed in at the haunted hotel in The Shining.
What's the glue in your story conflict? How might the applying concept of adhesive make your story stronger?