sentences:  Later, after the expedition has returned to the present, James convinces Professor Prochaska, the inventor of the time chamber, to send him back to the Cretaceous again—but at a point just prior to the emergence of the safari's earlier visit.His plan is to shoot Rivers and Aiyar the moment they originally came out of the time machine.Since that obviously had not happened, however, the space-time continuum avoids the paradox by spontaneously snapping James back to the present, the forces involved instantly killing him.