Jurassic Park What is Malcolm doing when he injured?

In Jurassic Park, Ian Malcolm is injured when he is trampled by a Gallimimus.

This happens when Malcolm, Ellie Sattler, and a group of children are running away from a herd of Gallimimus that has been startled by the Tyrannosaurus Rex. Malcolm stumbles and falls, and a Gallimimus steps on his leg, causing a severe injury.