Gentlemen, I envision a new and better T-Rex; a T-Rex capable of pitching baseballs faster, and further, than any mere human! I propose that he have some manner of steam powered ball propulsion device that would extend from his throat once a target is acquired, though I fear that this would make him a far deadlier predator and as such a greater threat to mankind. To remedy this I have designed a series of flash bulbs that will be affixed to the targeting apparatus, the purpose of course being to temporarily blind him upon target acquisition, allowing any humans to deftly step aside before he fires the volley of ultrasonic baseballs that would surely put an end to their life.
What they should have done was have the guy with a fake arm and when he goes to give the ball to the dinosaur he gets his arm bitten off and a little pump squirts fake blood all over the place and he starts screaming and rolling around and THEN the vendor wanders into the picture selling peanuts.