"This fight doesn't concern you, and you'd better step ..... before it does," the gangster warned the good Samaritan.

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"This fight doesn't concern you, and you'd better step ..... before it does," the gangster warned the good Samaritan. (*) by (*) through (*) off (*) over

This is a companion discussion topic for the original entry at https://english.best/questions/15829,this-fight-doesnt-concern-you-and-youd-better-step-___-before-it-does-the-gangster-warned-the-good-samaritan/