Dinosaurs that possess the Clamp ability cannot be affected by knockback

Tyrannosaurus, Tylosaurus and Sarcosuchus Imperator use the Clamp ability on land to grab a small dinosaur, enter the water and attack the small dinosaur once, go back ashore and release the small dinosaur, then they will become immune to knockback.

On land, use the Clamp ability to grab a smaller dinosaur. Move into water and attack the held small dinosaur once. Return to land and release the prey. The dinosaur will remain immune to knockback permanently.

Knockback immunity from the Clamp ability should only apply while actively holding a creature, and should be removed once the prey is released.