To be fair, that probably wouldn't have worked in real life (See the Lambert quote). Still funny though.
Quoting Lambert ( www.amazon.com/Ultimate-Dinosa… ): "Threatened by such a gang, a Tenontosaurus might have rolled over onto its attackers or turned suddenly to swing at them with its heavy tail. Such tactics may have killed several of the assailants. But meanwhile, the rest would have swarmed all over the ornithischian, inflicting other wounds. Weakened from loss of blood, the victim would have soon collapsed and died."