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Each man will take one shot at the dinosaur and the combination of the 3 shots will kill the dinosaur.
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After the dinosaur is spotted Mr.Eckels freaks out and runs off the metal path into the marsh and accidentally steps on a butterfly
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The other 2 men and the guides kill the dinosaur.
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After the dinosaur is dead the guide comes back to the time machine to check on Mr.Eckels and realizes the he went off the path which was the number one rule because he can drastically change the future.
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Before he could go home the guide made him go into the dinosaurs brain and get the bullets or else he would be left in the past.
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Mr.Eckels and 2 other men travel back in time with their 2 guides to kill a T-rex
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Once they arrive home they realize the just by him stepping on oner butterfly he has changed how people speak.