As Lesperance explains, it is very important for the hunters to go back in time and mark the dinosaur to be killed with red paint so that the safari goers kill one that is about to die anyway. The last thing the time traveler company wants to do is to change the future by altering the past.

Lesperance describes how he travels back in time, observes the dinosaurs, and sees which ones die and exactly when. He then comes back home, and goes back in time again so he can mark the correct dinosaur with the paintball before it dies. At that point, the safari hunters can embark and shoot the proper animal minutes before it would have died anyway. This way, they can have the thrill of hunting a T-Rex with no impact on history.

Travis impresses on the time travelers the importance of following all the protocols, because the tiniest change might have a multiplying effect that could alter the future in untold ways. The time travel company makes every effort to be cautious about what it does. Nevertheless, the story critiques using time travel technology in such a cavalier fashion as to allow rich people the indulgence of hunting dinosaurs to gratify their egos. We see the consequences when Eckels panics and changes the future in a dire way.