Those vehicles could still kill his family. He needs to make sure they will be alright. The panther grows the female panther to 800 feet in height and the cub to 600 feet in height. He did not want them so big they would eat all of his humans.
It turned out he was worried for nothing. They each spotted different groups of humans to pursue. The panthers each wandered off after their own meals.
The male panther easily caught up to his humans. He never even had to run. He always new humans were slow creatures, but at his size they may as well have been standing still.
The panther traps the humans between buildings that he knocks over in the paths they are fleeing on. This done, he can lay down and savor his meal. He places both of his front paws on a part, applying just enough pressure not to crush them. He then laps up the portion of the crowd that is within reach of his tongue, taking hundreds of people into his maw with each lick and swallowing them. He also licks up any of the humans that had been trying to crawl over his legs. He needed to clean his legs anyways the panther thought to himself. As he stood up to move forward he crushed those beneath his paws. Then he repeated the process with the next segment of terrified humans.
When he gets to the last segment of humans he once again decides to enjoy himself. He laps them up like before, but leaves his lips parted enough to give them some light. This turns out to be a mistake as he notices a few of the people take the leap from his lips to the ground a couple hundred feet below. The panther instantly clenches his teeth, putting an end to anyone who happened to be in that location.
He did like the feeling on his tongue as the people crowded against his teeth and tried to squirm in between them. The panther decided to test their grip on his teeth. The people in the panthers maw began to claw franticly at the teeth as the panther started to slowly tilt his head back. Despite their efforts, they began to lose their grips and fell into the cavernous gullet of the monstrous black beast.
The panther was surprised he still felt a few people hanging on to his teeth when his head was tilted straight up into the air. He was starting to feel full. So he decided to make reward them for their efforts. He let them out of his mouth. The humans, no more than a dozen, were still scared and covered in panther saliva but actually were not in that bad a shape. They watch the panther depart and pass out once they can no longer feel the tremors from the panthers paws.
The panther finds what he is looking for. A nice sunny area were he can sleep of his meal. With a full belly he quickly dozes of to sleep. He does not wake for a good 12 hours. He stretches and yawns as he wakes, showing the world his building sized fangs. He then notices what must be a human army preparing to greet him.