Disclaimer: the characters "Doyle" and "Roxton" are mine.
145 million years ago:
An Allosaurus was on the hunt, though not for food. He had picked up the scent of a female of his species, and was at just about the right age to mate.
Knowing that females are taller and more fierce, he knew that when he found the female, he had to stay at a distance. He watched her, as she stood face to face with a Diplodocus. The latter put up quite a fight, but all the femal Allosaurus did was let out a loud roar, and that roar seemed to form a sphere, which hit the Diplodocus like a cannonball, killing it instantly. Any other living creature in the near vicinity, that saw and felt this happening, ran off. All except this one male Allosaurus. By seeing her display what she just displayed, he felt all the more attracted to her. He approached her, less cautious than he did earlier. The female, however, is naturally paranoid. Although the Diplodocus is large enough for more than even two Allosauruses, it was her catch, and she wouldn't share it with anyone. She quickly turned to face the male. She stomped her foot, which somehow causes a grave force to come the male's way, in a fashion similar to how a mole digs it's way underground. The male, however, was quick to realize what was happening. He ran out of the force's line of fire, upon which he turned his back to the female, whipping his tail. Although the two were at a distance from each other, the female could still feel the whip of the male's tale. This helped her realize that her opponent had the same powers as she had. In other words, she couldn't use those powers as an element of surprise, like she always did, so she was forced to hand-on-hand combat. A fierce fight errupted between the two, which the male lost. Many of his bones were broken, making him too weak to do anything else. The female was ready to bite the male's neck, but changed her mind at the last second. She returned to eating her Diplodocus.
As said, the Diplodocus was too big for her, so she couldn't devour all its meat before she left. As the male was too weak to hunt for food of his own, he laid down, motionless, waiting for the female to leave. When she did, he thought he saw his chance to eat the rest, but others had beaten him to it. He tried that same whipping trick, but his broken bones caused him too much agony to try anything. He had no other choice but to withdraw from this, and return to his usual spot. Little did he know that that usual spot, will ultimately be his grave.