A gorgosaur attacked the herd of hadrosaur that the time-traveler Paula Shaffer was observing. As Paula was in the midst of the herd with an infant hadrosaur, she was caught up in the stampede the gorgosaur touched off. As the herd (and Paula) ran, another gorgosaur arrived, much to the anger of the first, which had felled one hadrosaur. This occupied all their attention and allowed Paula and the surviving hadrosaurs to escape.