Possible Clues:

• Period or comma
• What ends many a line, and what begins each of the puzzle's three other long answers
• Breaks up sentences, period
• Little dash, perhaps, that could give spice to man eating fish
• Muck up Tarantino's production, making literary point, e.g.?
• It could be a point all writers make
• Ending for a line
• Dash, for one
• Possibly stop making the meaning clear?
• Stop at the end of a sentence?