Paleontologists recently excavated two corresponding sets of dinosaur tracks, one left by a large grazing dinosaur and the other by a smaller predatory dinosaur  The two sets of tracks make abrupt turns repeatedly in tandem, suggesting that the predator was following the grazing dinosaur and had matched its stride  Modern predatory mammals, such as lions, usually match the stride of prey they are chasing immediately before they strike those prey
This suggests that the predatory dinosaur was chasing the grazing dinosaur and attacked immediately afterwards
It is the overall conclusion of the argument.