The police dog 'Stone' landed in a state of shock, completely clueless about what had just occurred. Its first reaction was to check its body and tail, probably to see if there were any injuries, and then it looked back at the path it had just traveled, evidently quite frightened, as if feeling an overwhelming fear.
It was spooked.
What puzzled Stone was that the humans nearby burst into applause, as if they were admiring its performance.
Its owner in military uniform also patted its forehead and gave it a tasty sausage to eat. With food involved, what else could matter?
Eat up!
As Stone devoured the delicious treat, everyone else felt extremely shocked. They understood what had happened: simply put, gravity had inverted.
What should have been gravity pulling downward had somehow shifted upward, which explained why Stone had entered and then seemed to disappear, able to walk upside down.